| 
                 
                    Closing price on 7/30/2018
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    90.00 | 
                 
                
                    | High | 
                    90.00 | 
                 
                
                    | Low | 
                    90.00 | 
                     
                
                    | Volume | 
                    500 | 
                                 
                
                    | Split-adjusted Price | 
                    69.83 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
CEN Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                7/30/2018
             | 
            
                0.00 / 0.00%
             |             
            
                90.00
             |           
            
                90.00
             |               
            
                90.00
             |                           
            
                90.00
             | 
            
                90.00
             |                     
            
                69.83
             |                                 
            
                500
             |            
            
                 
             |                                       
         
    
        
            | 
                7/27/2018
             | 
            
                0.00 / 0.00%
             |             
            
                90.00
             |           
            
                90.10
             |               
            
                90.00
             |                           
            
                90.00
             | 
            
                90.02
             |                     
            
                69.83
             |                                 
            
                600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/26/2018
             | 
            
                +0.20 / +0.22%
             |             
            
                90.00
             |           
            
                90.00
             |               
            
                90.00
             |                           
            
                90.00
             | 
            
                90.00
             |                     
            
                69.83
             |                                 
            
                800
             |            
            
                 
             |                                       
         
    
        
            | 
                7/25/2018
             | 
            
                -0.80 / -0.88%
             |             
            
                90.00
             |           
            
                90.00
             |               
            
                89.80
             |                           
            
                89.80
             | 
            
                89.98
             |                     
            
                69.67
             |                                 
            
                800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/24/2018
             | 
            
                -1.00 / -1.09%
             |             
            
                91.00
             |           
            
                91.00
             |               
            
                90.60
             |                           
            
                90.60
             | 
            
                90.94
             |                     
            
                70.30
             |                                 
            
                1,200
             |            
            
                 
             |                                       
         
    
        
            | 
                7/23/2018
             | 
            
                +11.30 / +14.07%
             |             
            
                91.60
             |           
            
                91.60
             |               
            
                91.60
             |                           
            
                91.60
             | 
            
                91.60
             |                     
            
                71.07
             |                                 
            
                200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/20/2018
             | 
            
                +10.40 / +14.88%
             |             
            
                80.30
             |           
            
                80.30
             |               
            
                80.30
             |                           
            
                80.30
             | 
            
                80.30
             |                     
            
                62.30
             |                                 
            
                1,800
             |            
            
                 
             |                                       
         
    
        
            | 
                7/19/2018
             | 
            
                +9.10 / +14.97%
             |             
            
                69.90
             |           
            
                69.90
             |               
            
                69.90
             |                           
            
                69.90
             | 
            
                69.90
             |                     
            
                54.23
             |                                 
            
                1,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/18/2018
             | 
            
                +7.90 / +14.93%
             |             
            
                60.80
             |           
            
                60.80
             |               
            
                60.80
             |                           
            
                60.80
             | 
            
                60.80
             |                     
            
                47.17
             |                                 
            
                1,400
             |            
            
                 
             |                                       
         
    
        
            | 
                7/17/2018
             | 
            
                +6.90 / +15.00%
             |             
            
                52.90
             |           
            
                52.90
             |               
            
                52.90
             |                           
            
                52.90
             | 
            
                52.90
             |                     
            
                41.04
             |                                 
            
                900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/16/2018
             | 
            
                +6.00 / +15.00%
             |             
            
                46.00
             |           
            
                46.00
             |               
            
                46.00
             |                           
            
                46.00
             | 
            
                46.00
             |                     
            
                35.69
             |                                 
            
                400
             |            
            
                 
             |                                       
         
    
        
            | 
                7/13/2018
             | 
            
                0.00 / 0.00%
             |             
            
                40.00
             |           
            
                40.00
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                31.04
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/12/2018
             | 
            
                0.00 / 0.00%
             |             
            
                40.00
             |           
            
                40.00
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                31.04
             |                                 
            
                200
             |            
            
                 
             |                                       
         
    
        
            | 
                7/11/2018
             | 
            
                0.00 / 0.00%
             |             
            
                40.00
             |           
            
                40.00
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                31.04
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/10/2018
             | 
            
                -1.90 / -4.53%
             |             
            
                40.40
             |           
            
                40.40
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.04
             |                     
            
                31.04
             |                                 
            
                1,100
             |            
            
                 
             |                                       
         
    
        
            | 
                7/9/2018
             | 
            
                -1.50 / -3.46%
             |             
            
                42.10
             |           
            
                42.10
             |               
            
                41.90
             |                           
            
                41.90
             | 
            
                41.98
             |                     
            
                32.51
             |                                 
            
                900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/6/2018
             | 
            
                -0.60 / -1.36%
             |             
            
                43.40
             |           
            
                43.40
             |               
            
                43.40
             |                           
            
                43.40
             | 
            
                43.40
             |                     
            
                33.67
             |                                 
            
                300
             |            
            
                 
             |                                       
         
    
        
            | 
                7/5/2018
             | 
            
                +4.00 / +10.00%
             |             
            
                44.00
             |           
            
                44.00
             |               
            
                44.00
             |                           
            
                44.00
             | 
            
                44.00
             |                     
            
                34.14
             |                                 
            
                5,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/4/2018
             | 
            
                +5.20 / +14.94%
             |             
            
                40.00
             |           
            
                40.00
             |               
            
                40.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                31.04
             |                                 
            
                1,700
             |            
            
                 
             |                                       
         
    
        
            | 
                7/3/2018
             | 
            
                0.00 / 0.00%
             |             
            
                34.80
             |           
            
                34.80
             |               
            
                34.80
             |                           
            
                34.80
             | 
            
                34.80
             |                     
            
                27.00
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/2/2018
             | 
            
                +4.50 / +14.85%
             |             
            
                34.80
             |           
            
                34.80
             |               
            
                34.80
             |                           
            
                34.80
             | 
            
                34.80
             |                     
            
                27.00
             |                                 
            
                1,000
             |            
            
                 
             |                                       
         
    
        
            | 
                6/29/2018
             | 
            
                +3.90 / +14.77%
             |             
            
                30.30
             |           
            
                30.30
             |               
            
                30.30
             |                           
            
                30.30
             | 
            
                30.30
             |                     
            
                23.51
             |                                 
            
                1,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/28/2018
             | 
            
                +3.40 / +14.78%
             |             
            
                26.40
             |           
            
                26.40
             |               
            
                26.40
             |                           
            
                26.40
             | 
            
                26.40
             |                     
            
                20.48
             |                                 
            
                1,000
             |            
            
                 
             |                                       
         
    
        
            | 
                6/27/2018
             | 
            
                +3.00 / +15.00%
             |             
            
                23.00
             |           
            
                23.00
             |               
            
                23.00
             |                           
            
                23.00
             | 
            
                23.00
             |                     
            
                17.85
             |                                 
            
                1,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/26/2018
             | 
            
                0.00 / 0.00%
             |             
            
                20.00
             |           
            
                20.00
             |               
            
                20.00
             |                           
            
                20.00
             | 
            
                20.00
             |                     
            
                15.52
             |                                 
            
                600
             |            
            
                 
             |                                       
         
    
        
            | 
                6/25/2018
             | 
            
                0.00 / 0.00%
             |             
            
                20.00
             |           
            
                20.00
             |               
            
                20.00
             |                           
            
                20.00
             | 
            
                20.00
             |                     
            
                15.52
             |                                 
            
                300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/22/2018
             | 
            
                -0.50 / -2.44%
             |             
            
                20.00
             |           
            
                20.00
             |               
            
                20.00
             |                           
            
                20.00
             | 
            
                20.00
             |                     
            
                15.52
             |                                 
            
                500
             |            
            
                 
             |                                       
         
    
        
            | 
                6/21/2018
             | 
            
                -0.30 / -1.44%
             |             
            
                20.50
             |           
            
                20.50
             |               
            
                20.50
             |                           
            
                20.50
             | 
            
                20.50
             |                     
            
                15.91
             |                                 
            
                500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/20/2018
             | 
            
                +1.80 / +9.47%
             |             
            
                20.80
             |           
            
                20.80
             |               
            
                20.80
             |                           
            
                20.80
             | 
            
                20.80
             |                     
            
                16.14
             |                                 
            
                400
             |            
            
                 
             |                                       
         
    
        
            | 
                6/19/2018
             | 
            
                +2.40 / +14.46%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                14.74
             |                                 
            
                200
             |  
            
                 
             |                                                              
             
    
         
    
    
 |