| 
                 
                    Closing price on 5/28/2018
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    92.50 | 
                 
                
                    | High | 
                    92.50 | 
                 
                
                    | Low | 
                    87.50 | 
                     
                
                    | Volume | 
                    91,340 | 
                                 
                
                    | Split-adjusted Price | 
                    32.32 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PTB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/28/2018
             | 
            
                -2.20 / -2.34%
             |             
            
                92.50
             |           
            
                92.50
             |               
            
                87.50
             |                           
            
                91.80
             | 
            
                89.51
             |                     
            
                32.32
             |                                 
            
                91,340
             |            
            
                 
             |                                       
         
    
        
            | 
                5/25/2018
             | 
            
                +1.00 / +1.08%
             |             
            
                96.80
             |           
            
                96.80
             |               
            
                92.50
             |                           
            
                94.00
             | 
            
                93.83
             |                     
            
                33.09
             |                                 
            
                17,830
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/24/2018
             | 
            
                -1.90 / -2.00%
             |             
            
                93.50
             |           
            
                96.40
             |               
            
                93.00
             |                           
            
                93.00
             | 
            
                93.55
             |                     
            
                32.74
             |                                 
            
                27,270
             |            
            
                 
             |                                       
         
    
        
            | 
                5/23/2018
             | 
            
                0.00 / 0.00%
             |             
            
                95.90
             |           
            
                95.90
             |               
            
                93.00
             |                           
            
                94.90
             | 
            
                94.41
             |                     
            
                33.41
             |                                 
            
                5,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/22/2018
             | 
            
                -1.60 / -1.66%
             |             
            
                95.00
             |           
            
                96.00
             |               
            
                93.00
             |                           
            
                94.90
             | 
            
                94.03
             |                     
            
                33.41
             |                                 
            
                30,830
             |            
            
                 
             |                                       
         
    
        
            | 
                5/21/2018
             | 
            
                +0.50 / +0.52%
             |             
            
                95.50
             |           
            
                97.00
             |               
            
                94.50
             |                           
            
                96.50
             | 
            
                95.83
             |                     
            
                33.97
             |                                 
            
                49,110
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/18/2018
             | 
            
                -0.90 / -0.93%
             |             
            
                96.70
             |           
            
                96.80
             |               
            
                94.50
             |                           
            
                96.00
             | 
            
                95.15
             |                     
            
                33.80
             |                                 
            
                8,460
             |            
            
                 
             |                                       
         
    
        
            | 
                5/17/2018
             | 
            
                +1.30 / +1.36%
             |             
            
                97.50
             |           
            
                99.00
             |               
            
                95.60
             |                           
            
                96.90
             | 
            
                95.95
             |                     
            
                34.11
             |                                 
            
                46,870
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/16/2018
             | 
            
                -2.30 / -2.35%
             |             
            
                98.50
             |           
            
                98.50
             |               
            
                95.60
             |                           
            
                95.60
             | 
            
                95.86
             |                     
            
                33.66
             |                                 
            
                3,620
             |            
            
                 
             |                                       
         
    
        
            | 
                5/15/2018
             | 
            
                +2.90 / +3.05%
             |             
            
                96.00
             |           
            
                98.00
             |               
            
                95.00
             |                           
            
                97.90
             | 
            
                96.30
             |                     
            
                34.47
             |                                 
            
                56,770
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/14/2018
             | 
            
                +0.20 / +0.21%
             |             
            
                97.00
             |           
            
                97.00
             |               
            
                94.00
             |                           
            
                95.00
             | 
            
                94.98
             |                     
            
                33.45
             |                                 
            
                44,830
             |            
            
                 
             |                                       
         
    
        
            | 
                5/11/2018
             | 
            
                -0.20 / -0.21%
             |             
            
                96.00
             |           
            
                96.00
             |               
            
                93.50
             |                           
            
                94.80
             | 
            
                94.68
             |                     
            
                33.37
             |                                 
            
                13,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/10/2018
             | 
            
                -2.00 / -2.06%
             |             
            
                95.00
             |           
            
                97.00
             |               
            
                94.00
             |                           
            
                95.00
             | 
            
                95.09
             |                     
            
                33.45
             |                                 
            
                37,920
             |            
            
                 
             |                                       
         
    
        
            | 
                5/9/2018
             | 
            
                -0.50 / -0.51%
             |             
            
                98.20
             |           
            
                98.20
             |               
            
                95.00
             |                           
            
                97.00
             | 
            
                96.11
             |                     
            
                34.15
             |                                 
            
                10,530
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/8/2018
             | 
            
                +0.50 / +0.52%
             |             
            
                99.70
             |           
            
                99.70
             |               
            
                96.50
             |                           
            
                97.50
             | 
            
                96.83
             |                     
            
                34.33
             |                                 
            
                7,560
             |            
            
                 
             |                                       
         
    
        
            | 
                5/7/2018
             | 
            
                +2.20 / +2.32%
             |             
            
                94.90
             |           
            
                98.00
             |               
            
                94.60
             |                           
            
                97.00
             | 
            
                95.31
             |                     
            
                34.15
             |                                 
            
                30,270
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/4/2018
             | 
            
                +0.30 / +0.32%
             |             
            
                94.80
             |           
            
                94.90
             |               
            
                93.50
             |                           
            
                94.80
             | 
            
                94.02
             |                     
            
                33.37
             |                                 
            
                13,710
             |            
            
                 
             |                                       
         
    
        
            | 
                5/3/2018
             | 
            
                +3.20 / +3.50%
             |             
            
                93.90
             |           
            
                94.90
             |               
            
                90.50
             |                           
            
                94.50
             | 
            
                92.80
             |                     
            
                33.27
             |                                 
            
                52,240
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/2/2018
             | 
            
                +1.10 / +1.22%
             |             
            
                90.00
             |           
            
                93.00
             |               
            
                90.00
             |                           
            
                91.30
             | 
            
                91.87
             |                     
            
                32.14
             |                                 
            
                206,230
             |            
            
                 
             |                                       
         
    
        
            | 
                4/27/2018
             | 
            
                +1.00 / +1.12%
             |             
            
                86.60
             |           
            
                94.00
             |               
            
                86.60
             |                           
            
                90.20
             | 
            
                89.76
             |                     
            
                31.76
             |                                 
            
                26,160
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/26/2018
             | 
            
                -6.30 / -6.60%
             |             
            
                95.50
             |           
            
                95.50
             |               
            
                89.00
             |                           
            
                89.20
             | 
            
                92.04
             |                     
            
                31.40
             |                                 
            
                127,490
             |            
            
                 
             |                                       
         
    
        
            | 
                4/24/2018
             | 
            
                -1.50 / -1.55%
             |             
            
                95.10
             |           
            
                97.00
             |               
            
                95.00
             |                           
            
                95.50
             | 
            
                96.57
             |                     
            
                33.62
             |                                 
            
                52,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/23/2018
             | 
            
                -2.90 / -2.90%
             |             
            
                100.00
             |           
            
                100.00
             |               
            
                97.00
             |                           
            
                97.00
             | 
            
                98.04
             |                     
            
                34.15
             |                                 
            
                69,360
             |            
            
                 
             |                                       
         
    
        
            | 
                4/20/2018
             | 
            
                +1.60 / +1.63%
             |             
            
                99.80
             |           
            
                100.00
             |               
            
                97.00
             |                           
            
                99.90
             | 
            
                98.61
             |                     
            
                35.17
             |                                 
            
                61,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/19/2018
             | 
            
                -2.70 / -2.67%
             |             
            
                101.20
             |           
            
                101.20
             |               
            
                96.00
             |                           
            
                98.30
             | 
            
                98.00
             |                     
            
                34.61
             |                                 
            
                71,560
             |            
            
                 
             |                                       
         
    
        
            | 
                4/18/2018
             | 
            
                -1.00 / -0.98%
             |             
            
                99.90
             |           
            
                102.00
             |               
            
                99.90
             |                           
            
                101.00
             | 
            
                101.21
             |                     
            
                35.56
             |                                 
            
                54,430
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/17/2018
             | 
            
                +0.60 / +0.59%
             |             
            
                101.10
             |           
            
                103.90
             |               
            
                99.60
             |                           
            
                102.00
             | 
            
                100.45
             |                     
            
                35.91
             |                                 
            
                64,740
             |            
            
                 
             |                                       
         
    
        
            | 
                4/16/2018
             | 
            
                -0.30 / -0.29%
             |             
            
                103.90
             |           
            
                103.90
             |               
            
                101.00
             |                           
            
                101.40
             | 
            
                101.33
             |                     
            
                35.70
             |                                 
            
                7,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/13/2018
             | 
            
                -2.30 / -2.21%
             |             
            
                102.00
             |           
            
                105.00
             |               
            
                101.50
             |                           
            
                101.70
             | 
            
                101.95
             |                     
            
                35.80
             |                                 
            
                15,910
             |            
            
                 
             |                                       
         
    
        
            | 
                4/12/2018
             | 
            
                +2.00 / +1.96%
             |             
            
                101.20
             |           
            
                107.00
             |               
            
                101.20
             |                           
            
                104.00
             | 
            
                104.41
             |                     
            
                36.61
             |                                 
            
                48,250
             |  
            
                 
             |                                                              
             
    
         
    
    
 |