| 
                 
                    Closing price on 3/26/2018
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    102.00 | 
                 
                
                    | High | 
                    105.90 | 
                 
                
                    | Low | 
                    102.00 | 
                     
                
                    | Volume | 
                    67,940 | 
                                 
                
                    | Split-adjusted Price | 
                    36.82 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PTB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/26/2018
             | 
            
                +0.60 / +0.58%
             |             
            
                102.00
             |           
            
                105.90
             |               
            
                102.00
             |                           
            
                104.60
             | 
            
                104.35
             |                     
            
                36.82
             |                                 
            
                67,940
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2018
             | 
            
                -1.50 / -1.42%
             |             
            
                104.50
             |           
            
                105.40
             |               
            
                103.70
             |                           
            
                104.00
             | 
            
                104.07
             |                     
            
                36.61
             |                                 
            
                67,260
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/22/2018
             | 
            
                +0.60 / +0.57%
             |             
            
                105.00
             |           
            
                106.50
             |               
            
                105.00
             |                           
            
                105.50
             | 
            
                105.09
             |                     
            
                37.14
             |                                 
            
                61,310
             |            
            
                 
             |                                       
         
    
        
            | 
                3/21/2018
             | 
            
                -0.20 / -0.19%
             |             
            
                106.00
             |           
            
                106.30
             |               
            
                104.50
             |                           
            
                104.90
             | 
            
                105.21
             |                     
            
                36.93
             |                                 
            
                111,690
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/20/2018
             | 
            
                -2.40 / -2.23%
             |             
            
                107.00
             |           
            
                107.80
             |               
            
                105.10
             |                           
            
                105.10
             | 
            
                106.20
             |                     
            
                37.00
             |                                 
            
                49,380
             |            
            
                 
             |                                       
         
    
        
            | 
                3/19/2018
             | 
            
                -0.40 / -0.37%
             |             
            
                107.90
             |           
            
                110.00
             |               
            
                107.00
             |                           
            
                107.50
             | 
            
                107.57
             |                     
            
                37.85
             |                                 
            
                63,510
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/16/2018
             | 
            
                +1.40 / +1.31%
             |             
            
                110.00
             |           
            
                110.00
             |               
            
                106.10
             |                           
            
                107.90
             | 
            
                106.66
             |                     
            
                37.99
             |                                 
            
                37,390
             |            
            
                 
             |                                       
         
    
        
            | 
                3/15/2018
             | 
            
                -5.00 / -4.48%
             |             
            
                111.50
             |           
            
                111.50
             |               
            
                106.50
             |                           
            
                106.50
             | 
            
                108.40
             |                     
            
                37.49
             |                                 
            
                52,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/14/2018
             | 
            
                -14.00 / -11.16%
             |             
            
                114.00
             |           
            
                114.00
             |               
            
                108.00
             |                           
            
                111.50
             | 
            
                111.89
             |                     
            
                39.25
             |                                 
            
                19,260
             |            
            
                 
             |                                       
         
    
        
            | 
                3/13/2018
             | 
            
                -0.50 / -0.40%
             |             
            
                126.50
             |           
            
                126.50
             |               
            
                124.30
             |                           
            
                125.50
             | 
            
                125.06
             |                     
            
                38.87
             |                                 
            
                84,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/12/2018
             | 
            
                +1.00 / +0.80%
             |             
            
                125.00
             |           
            
                126.50
             |               
            
                125.00
             |                           
            
                126.00
             | 
            
                125.73
             |                     
            
                39.03
             |                                 
            
                78,160
             |            
            
                 
             |                                       
         
    
        
            | 
                3/9/2018
             | 
            
                +1.20 / +0.97%
             |             
            
                124.50
             |           
            
                125.50
             |               
            
                124.00
             |                           
            
                125.00
             | 
            
                124.90
             |                     
            
                38.72
             |                                 
            
                36,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/8/2018
             | 
            
                +0.90 / +0.73%
             |             
            
                123.00
             |           
            
                124.50
             |               
            
                123.00
             |                           
            
                123.80
             | 
            
                123.87
             |                     
            
                38.35
             |                                 
            
                32,090
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2018
             | 
            
                +0.20 / +0.16%
             |             
            
                123.00
             |           
            
                125.00
             |               
            
                122.70
             |                           
            
                122.90
             | 
            
                123.36
             |                     
            
                38.07
             |                                 
            
                33,310
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/6/2018
             | 
            
                +0.20 / +0.16%
             |             
            
                122.00
             |           
            
                123.30
             |               
            
                122.00
             |                           
            
                122.70
             | 
            
                122.98
             |                     
            
                38.01
             |                                 
            
                19,540
             |            
            
                 
             |                                       
         
    
        
            | 
                3/5/2018
             | 
            
                -1.00 / -0.81%
             |             
            
                124.00
             |           
            
                124.00
             |               
            
                122.00
             |                           
            
                122.50
             | 
            
                122.45
             |                     
            
                37.94
             |                                 
            
                44,550
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/2/2018
             | 
            
                -1.00 / -0.80%
             |             
            
                124.50
             |           
            
                124.50
             |               
            
                122.30
             |                           
            
                123.50
             | 
            
                123.37
             |                     
            
                38.25
             |                                 
            
                46,940
             |            
            
                 
             |                                       
         
    
        
            | 
                3/1/2018
             | 
            
                -1.00 / -0.80%
             |             
            
                125.50
             |           
            
                125.50
             |               
            
                124.50
             |                           
            
                124.50
             | 
            
                124.77
             |                     
            
                38.56
             |                                 
            
                26,120
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/28/2018
             | 
            
                +0.50 / +0.40%
             |             
            
                125.10
             |           
            
                127.50
             |               
            
                125.00
             |                           
            
                125.50
             | 
            
                126.11
             |                     
            
                38.87
             |                                 
            
                47,950
             |            
            
                 
             |                                       
         
    
        
            | 
                2/27/2018
             | 
            
                +3.50 / +2.88%
             |             
            
                122.90
             |           
            
                125.00
             |               
            
                121.60
             |                           
            
                125.00
             | 
            
                122.57
             |                     
            
                38.72
             |                                 
            
                71,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/26/2018
             | 
            
                -4.50 / -3.57%
             |             
            
                125.00
             |           
            
                125.10
             |               
            
                121.10
             |                           
            
                121.50
             | 
            
                122.63
             |                     
            
                37.63
             |                                 
            
                63,190
             |            
            
                 
             |                                       
         
    
        
            | 
                2/23/2018
             | 
            
                -1.90 / -1.49%
             |             
            
                126.00
             |           
            
                127.50
             |               
            
                123.00
             |                           
            
                126.00
             | 
            
                124.27
             |                     
            
                39.03
             |                                 
            
                80,230
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/22/2018
             | 
            
                -0.80 / -0.62%
             |             
            
                126.70
             |           
            
                129.00
             |               
            
                126.00
             |                           
            
                127.90
             | 
            
                127.27
             |                     
            
                39.62
             |                                 
            
                31,020
             |            
            
                 
             |                                       
         
    
        
            | 
                2/21/2018
             | 
            
                -1.20 / -0.92%
             |             
            
                130.00
             |           
            
                130.00
             |               
            
                128.50
             |                           
            
                128.70
             | 
            
                129.35
             |                     
            
                39.86
             |                                 
            
                13,460
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/13/2018
             | 
            
                +1.90 / +1.48%
             |             
            
                128.00
             |           
            
                131.00
             |               
            
                128.00
             |                           
            
                129.90
             | 
            
                129.71
             |                     
            
                40.24
             |                                 
            
                41,270
             |            
            
                 
             |                                       
         
    
        
            | 
                2/12/2018
             | 
            
                +2.10 / +1.67%
             |             
            
                128.00
             |           
            
                128.00
             |               
            
                126.00
             |                           
            
                128.00
             | 
            
                127.47
             |                     
            
                39.65
             |                                 
            
                14,850
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/9/2018
             | 
            
                +3.40 / +2.78%
             |             
            
                118.00
             |           
            
                125.90
             |               
            
                118.00
             |                           
            
                125.90
             | 
            
                121.85
             |                     
            
                39.00
             |                                 
            
                117,150
             |            
            
                 
             |                                       
         
    
        
            | 
                2/8/2018
             | 
            
                -1.00 / -0.81%
             |             
            
                120.70
             |           
            
                126.00
             |               
            
                120.70
             |                           
            
                122.50
             | 
            
                123.19
             |                     
            
                37.94
             |                                 
            
                80,590
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/7/2018
             | 
            
                +2.50 / +2.07%
             |             
            
                126.00
             |           
            
                126.00
             |               
            
                122.10
             |                           
            
                123.50
             | 
            
                123.43
             |                     
            
                38.25
             |                                 
            
                172,760
             |            
            
                 
             |                                       
         
    
        
            | 
                2/6/2018
             | 
            
                -6.00 / -4.72%
             |             
            
                123.00
             |           
            
                126.00
             |               
            
                118.50
             |                           
            
                121.00
             | 
            
                120.59
             |                     
            
                37.48
             |                                 
            
                266,760
             |  
            
                 
             |                                                              
             
    
         
    
    
 |