| 
                 
                    Closing price on 3/21/2018
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    33.20 | 
                 
                
                    | High | 
                    33.50 | 
                 
                
                    | Low | 
                    33.20 | 
                     
                
                    | Volume | 
                    42,322 | 
                                 
                
                    | Split-adjusted Price | 
                    21.44 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PGS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/21/2018
             | 
            
                +0.30 / +0.90%
             |             
            
                33.20
             |           
            
                33.50
             |               
            
                33.20
             |                           
            
                33.50
             | 
            
                33.43
             |                     
            
                21.44
             |                                 
            
                42,322
             |            
            
                 
             |                                       
         
    
        
            | 
                3/20/2018
             | 
            
                +0.20 / +0.61%
             |             
            
                33.00
             |           
            
                33.50
             |               
            
                33.00
             |                           
            
                33.20
             | 
            
                33.31
             |                     
            
                21.24
             |                                 
            
                15,973
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/19/2018
             | 
            
                0.00 / 0.00%
             |             
            
                33.00
             |           
            
                33.40
             |               
            
                32.80
             |                           
            
                33.00
             | 
            
                33.08
             |                     
            
                21.12
             |                                 
            
                17,600
             |            
            
                 
             |                                       
         
    
        
            | 
                3/16/2018
             | 
            
                +0.70 / +2.17%
             |             
            
                32.30
             |           
            
                33.00
             |               
            
                32.00
             |                           
            
                33.00
             | 
            
                32.77
             |                     
            
                21.12
             |                                 
            
                26,539
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/15/2018
             | 
            
                +0.30 / +0.94%
             |             
            
                31.00
             |           
            
                32.30
             |               
            
                31.00
             |                           
            
                32.30
             | 
            
                32.17
             |                     
            
                20.67
             |                                 
            
                2,364
             |            
            
                 
             |                                       
         
    
        
            | 
                3/14/2018
             | 
            
                +0.50 / +1.59%
             |             
            
                32.00
             |           
            
                32.00
             |               
            
                32.00
             |                           
            
                32.00
             | 
            
                32.00
             |                     
            
                20.48
             |                                 
            
                30,683
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/13/2018
             | 
            
                -1.00 / -3.08%
             |             
            
                32.50
             |           
            
                32.50
             |               
            
                31.00
             |                           
            
                31.50
             | 
            
                31.77
             |                     
            
                20.16
             |                                 
            
                11,339
             |            
            
                 
             |                                       
         
    
        
            | 
                3/12/2018
             | 
            
                +0.50 / +1.56%
             |             
            
                32.00
             |           
            
                32.50
             |               
            
                31.50
             |                           
            
                32.50
             | 
            
                31.85
             |                     
            
                20.80
             |                                 
            
                15,640
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/9/2018
             | 
            
                +0.50 / +1.59%
             |             
            
                32.00
             |           
            
                32.00
             |               
            
                32.00
             |                           
            
                32.00
             | 
            
                32.00
             |                     
            
                20.48
             |                                 
            
                2,868
             |            
            
                 
             |                                       
         
    
        
            | 
                3/8/2018
             | 
            
                +0.50 / +1.61%
             |             
            
                31.50
             |           
            
                31.50
             |               
            
                31.50
             |                           
            
                31.50
             | 
            
                31.50
             |                     
            
                20.16
             |                                 
            
                2,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/7/2018
             | 
            
                0.00 / 0.00%
             |             
            
                31.00
             |           
            
                31.00
             |               
            
                31.00
             |                           
            
                31.00
             | 
            
                31.00
             |                     
            
                19.84
             |                                 
            
                110,500
             |            
            
                 
             |                                       
         
    
        
            | 
                3/6/2018
             | 
            
                -3.00 / -8.82%
             |             
            
                31.00
             |           
            
                33.00
             |               
            
                31.00
             |                           
            
                31.00
             | 
            
                31.01
             |                     
            
                19.84
             |                                 
            
                25,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/5/2018
             | 
            
                +0.50 / +1.49%
             |             
            
                32.00
             |           
            
                34.00
             |               
            
                30.30
             |                           
            
                34.00
             | 
            
                31.06
             |                     
            
                21.76
             |                                 
            
                6,936
             |            
            
                 
             |                                       
         
    
        
            | 
                3/2/2018
             | 
            
                +0.50 / +1.52%
             |             
            
                33.00
             |           
            
                33.50
             |               
            
                33.00
             |                           
            
                33.50
             | 
            
                33.08
             |                     
            
                21.44
             |                                 
            
                9,403
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/1/2018
             | 
            
                +0.70 / +2.17%
             |             
            
                32.30
             |           
            
                34.00
             |               
            
                32.20
             |                           
            
                33.00
             | 
            
                32.35
             |                     
            
                21.12
             |                                 
            
                17,483
             |            
            
                 
             |                                       
         
    
        
            | 
                2/28/2018
             | 
            
                -0.20 / -0.62%
             |             
            
                32.00
             |           
            
                34.00
             |               
            
                32.00
             |                           
            
                32.30
             | 
            
                32.78
             |                     
            
                20.67
             |                                 
            
                3,129
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/27/2018
             | 
            
                +1.00 / +3.17%
             |             
            
                32.50
             |           
            
                32.50
             |               
            
                32.50
             |                           
            
                32.50
             | 
            
                32.50
             |                     
            
                20.80
             |                                 
            
                815
             |            
            
                 
             |                                       
         
    
        
            | 
                2/26/2018
             | 
            
                -2.50 / -7.35%
             |             
            
                33.00
             |           
            
                33.00
             |               
            
                31.00
             |                           
            
                31.50
             | 
            
                31.10
             |                     
            
                20.16
             |                                 
            
                52,996
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/23/2018
             | 
            
                0.00 / 0.00%
             |             
            
                34.00
             |           
            
                34.60
             |               
            
                34.00
             |                           
            
                34.00
             | 
            
                34.15
             |                     
            
                21.76
             |                                 
            
                3,869
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2018
             | 
            
                +0.20 / +0.59%
             |             
            
                34.00
             |           
            
                34.00
             |               
            
                34.00
             |                           
            
                34.00
             | 
            
                34.00
             |                     
            
                21.76
             |                                 
            
                328
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/21/2018
             | 
            
                +1.30 / +4.00%
             |             
            
                32.50
             |           
            
                33.80
             |               
            
                32.50
             |                           
            
                33.80
             | 
            
                32.98
             |                     
            
                21.63
             |                                 
            
                36,503
             |            
            
                 
             |                                       
         
    
        
            | 
                2/13/2018
             | 
            
                +2.50 / +8.33%
             |             
            
                33.00
             |           
            
                33.00
             |               
            
                31.00
             |                           
            
                32.50
             | 
            
                31.22
             |                     
            
                20.80
             |                                 
            
                1,513
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/12/2018
             | 
            
                -2.00 / -6.25%
             |             
            
                32.20
             |           
            
                32.20
             |               
            
                30.00
             |                           
            
                30.00
             | 
            
                30.26
             |                     
            
                19.20
             |                                 
            
                31,628
             |            
            
                 
             |                                       
         
    
        
            | 
                2/9/2018
             | 
            
                -2.50 / -7.25%
             |             
            
                32.00
             |           
            
                34.60
             |               
            
                32.00
             |                           
            
                32.00
             | 
            
                32.04
             |                     
            
                20.48
             |                                 
            
                1,202,579
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/8/2018
             | 
            
                +0.30 / +0.88%
             |             
            
                32.00
             |           
            
                34.90
             |               
            
                32.00
             |                           
            
                34.50
             | 
            
                34.48
             |                     
            
                22.08
             |                                 
            
                47,610
             |            
            
                 
             |                                       
         
    
        
            | 
                2/7/2018
             | 
            
                -0.60 / -1.72%
             |             
            
                35.00
             |           
            
                36.00
             |               
            
                34.20
             |                           
            
                34.20
             | 
            
                35.10
             |                     
            
                21.88
             |                                 
            
                84,697
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/6/2018
             | 
            
                -0.70 / -1.97%
             |             
            
                33.50
             |           
            
                35.50
             |               
            
                32.00
             |                           
            
                34.80
             | 
            
                32.49
             |                     
            
                22.27
             |                                 
            
                210,625
             |            
            
                 
             |                                       
         
    
        
            | 
                2/5/2018
             | 
            
                +1.50 / +4.41%
             |             
            
                34.00
             |           
            
                35.50
             |               
            
                33.00
             |                           
            
                35.50
             | 
            
                34.30
             |                     
            
                22.72
             |                                 
            
                47,758
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/2/2018
             | 
            
                -2.70 / -7.36%
             |             
            
                36.00
             |           
            
                36.00
             |               
            
                34.00
             |                           
            
                34.00
             | 
            
                35.83
             |                     
            
                21.76
             |                                 
            
                13,867
             |            
            
                 
             |                                       
         
    
        
            | 
                2/1/2018
             | 
            
                -0.30 / -0.81%
             |             
            
                37.00
             |           
            
                37.00
             |               
            
                36.00
             |                           
            
                36.70
             | 
            
                36.24
             |                     
            
                23.48
             |                                 
            
                15,919
             |  
            
                 
             |                                                              
             
    
         
    
    
 |