| 
                 
                    Closing price on 10/24/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    27.00 | 
                 
                
                    | High | 
                    28.40 | 
                 
                
                    | Low | 
                    25.00 | 
                     
                
                    | Volume | 
                    165,400 | 
                                 
                
                    | Split-adjusted Price | 
                    15.91 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
CVN Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                10/24/2011
             | 
            
                +1.10 / +4.60%
             |             
            
                27.00
             |           
            
                28.40
             |               
            
                25.00
             |                           
            
                25.00
             | 
            
                28.37
             |                     
            
                15.91
             |                                 
            
                165,400
             |            
            
                 
             |                                       
         
    
        
            | 
                10/21/2011
             | 
            
                +1.30 / +5.75%
             |             
            
                27.20
             |           
            
                27.20
             |               
            
                23.90
             |                           
            
                23.90
             | 
            
                26.81
             |                     
            
                15.21
             |                                 
            
                202,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/20/2011
             | 
            
                +1.30 / +6.10%
             |             
            
                26.00
             |           
            
                26.00
             |               
            
                22.60
             |                           
            
                22.60
             | 
            
                25.64
             |                     
            
                14.38
             |                                 
            
                372,700
             |            
            
                 
             |                                       
         
    
        
            | 
                10/19/2011
             | 
            
                +0.90 / +4.41%
             |             
            
                24.50
             |           
            
                24.50
             |               
            
                21.30
             |                           
            
                21.30
             | 
            
                24.27
             |                     
            
                13.55
             |                                 
            
                37,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/18/2011
             | 
            
                +0.50 / +2.51%
             |             
            
                23.40
             |           
            
                23.40
             |               
            
                20.40
             |                           
            
                20.40
             | 
            
                22.93
             |                     
            
                12.98
             |                                 
            
                53,100
             |            
            
                 
             |                                       
         
    
        
            | 
                10/17/2011
             | 
            
                +0.80 / +4.19%
             |             
            
                20.00
             |           
            
                22.70
             |               
            
                19.90
             |                           
            
                19.90
             | 
            
                21.90
             |                     
            
                12.66
             |                                 
            
                57,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/14/2011
             | 
            
                +0.60 / +3.24%
             |             
            
                20.50
             |           
            
                21.80
             |               
            
                19.10
             |                           
            
                19.10
             | 
            
                21.28
             |                     
            
                12.15
             |                                 
            
                116,500
             |            
            
                 
             |                                       
         
    
        
            | 
                10/13/2011
             | 
            
                -1.20 / -6.09%
             |             
            
                20.90
             |           
            
                21.00
             |               
            
                18.40
             |                           
            
                18.50
             | 
            
                20.46
             |                     
            
                11.77
             |                                 
            
                198,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/12/2011
             | 
            
                +0.10 / +0.51%
             |             
            
                19.60
             |           
            
                19.80
             |               
            
                19.40
             |                           
            
                19.70
             | 
            
                19.65
             |                     
            
                12.54
             |                                 
            
                43,900
             |            
            
                 
             |                                       
         
    
        
            | 
                10/11/2011
             | 
            
                -1.40 / -6.67%
             |             
            
                19.60
             |           
            
                19.60
             |               
            
                19.60
             |                           
            
                19.60
             | 
            
                19.60
             |                     
            
                12.47
             |                                 
            
                168,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/10/2011
             | 
            
                -1.50 / -6.67%
             |             
            
                21.00
             |           
            
                21.00
             |               
            
                21.00
             |                           
            
                21.00
             | 
            
                21.00
             |                     
            
                13.36
             |                                 
            
                22,100
             |            
            
                 
             |                                       
         
    
        
            | 
                10/7/2011
             | 
            
                -1.60 / -6.64%
             |             
            
                22.50
             |           
            
                22.50
             |               
            
                22.50
             |                           
            
                22.50
             | 
            
                22.50
             |                     
            
                14.32
             |                                 
            
                166,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/6/2011
             | 
            
                0.00 / 0.00%
             |             
            
                24.10
             |           
            
                24.10
             |               
            
                24.10
             |                           
            
                24.10
             | 
            
                24.10
             |                     
            
                15.34
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                10/5/2011
             | 
            
                0.00 / 0.00%
             |             
            
                24.10
             |           
            
                24.10
             |               
            
                24.10
             |                           
            
                24.10
             | 
            
                24.10
             |                     
            
                15.34
             |                                 
            
                5,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/4/2011
             | 
            
                -1.80 / -6.95%
             |             
            
                24.10
             |           
            
                24.10
             |               
            
                24.10
             |                           
            
                24.10
             | 
            
                24.10
             |                     
            
                15.34
             |                                 
            
                200
             |            
            
                 
             |                                       
         
    
        
            | 
                10/3/2011
             | 
            
                0.00 / 0.00%
             |             
            
                25.90
             |           
            
                25.90
             |               
            
                25.90
             |                           
            
                25.90
             | 
            
                25.90
             |                     
            
                16.48
             |                                 
            
                100,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/30/2011
             | 
            
                -1.90 / -6.83%
             |             
            
                25.90
             |           
            
                25.90
             |               
            
                25.90
             |                           
            
                25.90
             | 
            
                25.90
             |                     
            
                16.48
             |                                 
            
                160,300
             |            
            
                 
             |                                       
         
    
        
            | 
                9/29/2011
             | 
            
                0.00 / 0.00%
             |             
            
                27.80
             |           
            
                27.80
             |               
            
                27.80
             |                           
            
                27.80
             | 
            
                27.80
             |                     
            
                17.69
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/28/2011
             | 
            
                0.00 / 0.00%
             |             
            
                27.80
             |           
            
                27.80
             |               
            
                27.80
             |                           
            
                27.80
             | 
            
                27.80
             |                     
            
                17.69
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                9/27/2011
             | 
            
                -0.10 / -0.36%
             |             
            
                27.80
             |           
            
                27.80
             |               
            
                27.80
             |                           
            
                27.80
             | 
            
                27.80
             |                     
            
                17.69
             |                                 
            
                20,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/26/2011
             | 
            
                +1.80 / +6.90%
             |             
            
                27.30
             |           
            
                27.90
             |               
            
                27.30
             |                           
            
                27.90
             | 
            
                27.83
             |                     
            
                17.75
             |                                 
            
                28,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/23/2011
             | 
            
                +0.80 / +3.16%
             |             
            
                27.00
             |           
            
                29.90
             |               
            
                26.10
             |                           
            
                26.10
             | 
            
                29.28
             |                     
            
                16.61
             |                                 
            
                84,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/22/2011
             | 
            
                -1.90 / -6.99%
             |             
            
                28.50
             |           
            
                28.50
             |               
            
                25.30
             |                           
            
                25.30
             | 
            
                28.04
             |                     
            
                16.10
             |                                 
            
                278,500
             |            
            
                 
             |                                       
         
    
        
            | 
                9/21/2011
             | 
            
                0.00 / 0.00%
             |             
            
                27.20
             |           
            
                27.20
             |               
            
                27.20
             |                           
            
                27.20
             | 
            
                27.20
             |                     
            
                17.31
             |                                 
            
                95,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/20/2011
             | 
            
                -2.00 / -6.85%
             |             
            
                27.20
             |           
            
                27.20
             |               
            
                27.20
             |                           
            
                27.20
             | 
            
                27.20
             |                     
            
                17.31
             |                                 
            
                81,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/19/2011
             | 
            
                -2.10 / -6.71%
             |             
            
                29.20
             |           
            
                29.20
             |               
            
                29.20
             |                           
            
                29.20
             | 
            
                29.20
             |                     
            
                18.58
             |                                 
            
                20,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/16/2011
             | 
            
                -2.30 / -6.85%
             |             
            
                31.30
             |           
            
                31.30
             |               
            
                31.30
             |                           
            
                31.30
             | 
            
                31.30
             |                     
            
                19.92
             |                                 
            
                10,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/15/2011
             | 
            
                0.00 / 0.00%
             |             
            
                33.60
             |           
            
                33.60
             |               
            
                33.60
             |                           
            
                33.60
             | 
            
                33.60
             |                     
            
                21.38
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/14/2011
             | 
            
                -2.50 / -6.93%
             |             
            
                33.60
             |           
            
                33.60
             |               
            
                33.60
             |                           
            
                33.60
             | 
            
                33.60
             |                     
            
                21.38
             |                                 
            
                200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/13/2011
             | 
            
                -2.70 / -6.96%
             |             
            
                36.10
             |           
            
                36.10
             |               
            
                36.10
             |                           
            
                36.10
             | 
            
                36.10
             |                     
            
                22.97
             |                                 
            
                900
             |  
            
                 
             |                                                              
             
    
         
    
    
 |