| 
                 
                    Closing price on 12/15/2017
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    23.00 | 
                 
                
                    | High | 
                    23.30 | 
                 
                
                    | Low | 
                    23.00 | 
                     
                
                    | Volume | 
                    38,102 | 
                                 
                
                    | Split-adjusted Price | 
                    14.72 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PGS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                12/15/2017
             | 
            
                0.00 / 0.00%
             |             
            
                23.00
             |           
            
                23.30
             |               
            
                23.00
             |                           
            
                23.00
             | 
            
                23.03
             |                     
            
                14.72
             |                                 
            
                38,102
             |            
            
                 
             |                                       
         
    
        
            | 
                12/14/2017
             | 
            
                -0.30 / -1.29%
             |             
            
                22.90
             |           
            
                23.30
             |               
            
                22.90
             |                           
            
                23.00
             | 
            
                23.05
             |                     
            
                14.72
             |                                 
            
                55,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/13/2017
             | 
            
                0.00 / 0.00%
             |             
            
                23.30
             |           
            
                23.30
             |               
            
                23.30
             |                           
            
                23.30
             | 
            
                23.30
             |                     
            
                14.91
             |                                 
            
                1,060
             |            
            
                 
             |                                       
         
    
        
            | 
                12/12/2017
             | 
            
                +0.30 / +1.30%
             |             
            
                23.70
             |           
            
                24.00
             |               
            
                23.00
             |                           
            
                23.30
             | 
            
                23.02
             |                     
            
                14.91
             |                                 
            
                76,904
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/11/2017
             | 
            
                -0.70 / -2.95%
             |             
            
                23.00
             |           
            
                23.00
             |               
            
                23.00
             |                           
            
                23.00
             | 
            
                23.00
             |                     
            
                14.72
             |                                 
            
                5,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/8/2017
             | 
            
                +0.30 / +1.28%
             |             
            
                23.40
             |           
            
                23.70
             |               
            
                23.40
             |                           
            
                23.70
             | 
            
                23.42
             |                     
            
                15.17
             |                                 
            
                5,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/7/2017
             | 
            
                +0.20 / +0.86%
             |             
            
                22.50
             |           
            
                23.40
             |               
            
                22.50
             |                           
            
                23.40
             | 
            
                22.85
             |                     
            
                14.97
             |                                 
            
                17,238
             |            
            
                 
             |                                       
         
    
        
            | 
                12/6/2017
             | 
            
                -0.40 / -1.69%
             |             
            
                23.40
             |           
            
                23.50
             |               
            
                23.00
             |                           
            
                23.20
             | 
            
                23.17
             |                     
            
                14.85
             |                                 
            
                6,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/5/2017
             | 
            
                +0.20 / +0.85%
             |             
            
                23.20
             |           
            
                23.60
             |               
            
                22.00
             |                           
            
                23.60
             | 
            
                23.41
             |                     
            
                15.10
             |                                 
            
                26,320
             |            
            
                 
             |                                       
         
    
        
            | 
                12/4/2017
             | 
            
                +0.20 / +0.86%
             |             
            
                23.30
             |           
            
                23.40
             |               
            
                23.30
             |                           
            
                23.40
             | 
            
                23.39
             |                     
            
                14.97
             |                                 
            
                10,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/1/2017
             | 
            
                +0.10 / +0.43%
             |             
            
                23.10
             |           
            
                23.20
             |               
            
                23.00
             |                           
            
                23.20
             | 
            
                23.05
             |                     
            
                14.85
             |                                 
            
                217,670
             |            
            
                 
             |                                       
         
    
        
            | 
                11/30/2017
             | 
            
                0.00 / 0.00%
             |             
            
                23.00
             |           
            
                23.10
             |               
            
                23.00
             |                           
            
                23.10
             | 
            
                23.00
             |                     
            
                14.78
             |                                 
            
                10,450
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/29/2017
             | 
            
                +0.20 / +0.87%
             |             
            
                23.00
             |           
            
                23.10
             |               
            
                23.00
             |                           
            
                23.10
             | 
            
                23.03
             |                     
            
                14.78
             |                                 
            
                22,610
             |            
            
                 
             |                                       
         
    
        
            | 
                11/28/2017
             | 
            
                -0.10 / -0.43%
             |             
            
                23.00
             |           
            
                23.10
             |               
            
                22.90
             |                           
            
                22.90
             | 
            
                23.00
             |                     
            
                14.65
             |                                 
            
                57,307
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/27/2017
             | 
            
                -0.10 / -0.43%
             |             
            
                23.10
             |           
            
                23.10
             |               
            
                23.00
             |                           
            
                23.00
             | 
            
                23.00
             |                     
            
                14.72
             |                                 
            
                150,000
             |            
            
                 
             |                                       
         
    
        
            | 
                11/24/2017
             | 
            
                +0.10 / +0.43%
             |             
            
                23.00
             |           
            
                23.10
             |               
            
                23.00
             |                           
            
                23.10
             | 
            
                23.00
             |                     
            
                14.78
             |                                 
            
                8,160
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/23/2017
             | 
            
                0.00 / 0.00%
             |             
            
                23.00
             |           
            
                23.00
             |               
            
                23.00
             |                           
            
                23.00
             | 
            
                23.00
             |                     
            
                14.72
             |                                 
            
                15
             |            
            
                 
             |                                       
         
    
        
            | 
                11/22/2017
             | 
            
                0.00 / 0.00%
             |             
            
                23.00
             |           
            
                23.10
             |               
            
                23.00
             |                           
            
                23.00
             | 
            
                23.01
             |                     
            
                14.72
             |                                 
            
                32,847
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/21/2017
             | 
            
                0.00 / 0.00%
             |             
            
                23.00
             |           
            
                23.00
             |               
            
                23.00
             |                           
            
                23.00
             | 
            
                23.00
             |                     
            
                14.72
             |                                 
            
                114,500
             |            
            
                 
             |                                       
         
    
        
            | 
                11/20/2017
             | 
            
                0.00 / 0.00%
             |             
            
                23.10
             |           
            
                23.10
             |               
            
                22.80
             |                           
            
                23.00
             | 
            
                22.99
             |                     
            
                14.72
             |                                 
            
                27,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/17/2017
             | 
            
                +0.30 / +1.32%
             |             
            
                23.90
             |           
            
                23.90
             |               
            
                22.80
             |                           
            
                23.00
             | 
            
                22.93
             |                     
            
                14.72
             |                                 
            
                21,736
             |            
            
                 
             |                                       
         
    
        
            | 
                11/16/2017
             | 
            
                -0.40 / -1.73%
             |             
            
                23.10
             |           
            
                23.20
             |               
            
                21.70
             |                           
            
                22.70
             | 
            
                22.98
             |                     
            
                14.53
             |                                 
            
                8,413
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/15/2017
             | 
            
                +0.10 / +0.43%
             |             
            
                23.00
             |           
            
                23.10
             |               
            
                23.00
             |                           
            
                23.10
             | 
            
                23.05
             |                     
            
                14.78
             |                                 
            
                73,010
             |            
            
                 
             |                                       
         
    
        
            | 
                11/14/2017
             | 
            
                0.00 / 0.00%
             |             
            
                23.00
             |           
            
                23.10
             |               
            
                23.00
             |                           
            
                23.00
             | 
            
                23.06
             |                     
            
                14.72
             |                                 
            
                12,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/13/2017
             | 
            
                +0.50 / +2.22%
             |             
            
                22.50
             |           
            
                23.00
             |               
            
                22.50
             |                           
            
                23.00
             | 
            
                22.77
             |                     
            
                14.72
             |                                 
            
                36,631
             |            
            
                 
             |                                       
         
    
        
            | 
                11/10/2017
             | 
            
                -0.40 / -1.75%
             |             
            
                22.20
             |           
            
                23.10
             |               
            
                22.20
             |                           
            
                22.50
             | 
            
                22.77
             |                     
            
                14.40
             |                                 
            
                3,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/9/2017
             | 
            
                +0.90 / +4.09%
             |             
            
                22.60
             |           
            
                22.90
             |               
            
                22.60
             |                           
            
                22.90
             | 
            
                22.65
             |                     
            
                14.65
             |                                 
            
                1,410
             |            
            
                 
             |                                       
         
    
        
            | 
                11/8/2017
             | 
            
                -0.50 / -2.22%
             |             
            
                22.00
             |           
            
                22.60
             |               
            
                22.00
             |                           
            
                22.00
             | 
            
                22.40
             |                     
            
                14.08
             |                                 
            
                18,943
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/7/2017
             | 
            
                +0.20 / +0.90%
             |             
            
                22.40
             |           
            
                22.50
             |               
            
                22.40
             |                           
            
                22.50
             | 
            
                22.45
             |                     
            
                14.40
             |                                 
            
                10,200
             |            
            
                 
             |                                       
         
    
        
            | 
                11/6/2017
             | 
            
                +0.40 / +1.83%
             |             
            
                22.90
             |           
            
                22.90
             |               
            
                21.80
             |                           
            
                22.30
             | 
            
                22.18
             |                     
            
                14.27
             |                                 
            
                22,210
             |  
            
                 
             |                                                              
             
    
         
    
    
 |