| 
                 
                    Closing price on 5/15/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    6.10 | 
                 
                
                    | High | 
                    6.20 | 
                 
                
                    | Low | 
                    6.10 | 
                     
                
                    | Volume | 
                    311,480 | 
                                 
                
                    | Split-adjusted Price | 
                    2.13 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VTO Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/15/2012
             | 
            
                -0.30 / -4.69%
             |             
            
                6.10
             |           
            
                6.20
             |               
            
                6.10
             |                           
            
                6.10
             | 
            
                6.10
             |                     
            
                2.13
             |                                 
            
                311,480
             |            
            
                 
             |                                       
         
    
        
            | 
                5/14/2012
             | 
            
                -0.30 / -4.48%
             |             
            
                6.50
             |           
            
                6.50
             |               
            
                6.40
             |                           
            
                6.40
             | 
            
                6.40
             |                     
            
                2.23
             |                                 
            
                203,940
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/11/2012
             | 
            
                -0.30 / -4.29%
             |             
            
                7.00
             |           
            
                7.00
             |               
            
                6.70
             |                           
            
                6.70
             | 
            
                6.70
             |                     
            
                2.34
             |                                 
            
                416,410
             |            
            
                 
             |                                       
         
    
        
            | 
                5/10/2012
             | 
            
                +0.20 / +2.94%
             |             
            
                6.80
             |           
            
                7.10
             |               
            
                6.70
             |                           
            
                7.00
             | 
            
                7.00
             |                     
            
                2.44
             |                                 
            
                528,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/9/2012
             | 
            
                -0.30 / -4.23%
             |             
            
                6.30
             |           
            
                6.80
             |               
            
                6.30
             |                           
            
                6.80
             | 
            
                6.80
             |                     
            
                2.37
             |                                 
            
                504,270
             |            
            
                 
             |                                       
         
    
        
            | 
                5/8/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.30
             |           
            
                7.40
             |               
            
                7.10
             |                           
            
                7.10
             | 
            
                7.10
             |                     
            
                2.27
             |                                 
            
                535,990
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/7/2012
             | 
            
                +0.30 / +4.41%
             |             
            
                6.90
             |           
            
                7.10
             |               
            
                6.90
             |                           
            
                7.10
             | 
            
                7.10
             |                     
            
                2.27
             |                                 
            
                761,050
             |            
            
                 
             |                                       
         
    
        
            | 
                5/4/2012
             | 
            
                0.00 / 0.00%
             |             
            
                6.80
             |           
            
                7.10
             |               
            
                6.70
             |                           
            
                6.80
             | 
            
                6.80
             |                     
            
                2.17
             |                                 
            
                495,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/3/2012
             | 
            
                +0.30 / +4.62%
             |             
            
                6.30
             |           
            
                6.80
             |               
            
                6.20
             |                           
            
                6.80
             | 
            
                6.80
             |                     
            
                2.17
             |                                 
            
                659,850
             |            
            
                 
             |                                       
         
    
        
            | 
                5/2/2012
             | 
            
                +0.10 / +1.56%
             |             
            
                6.60
             |           
            
                6.70
             |               
            
                6.50
             |                           
            
                6.50
             | 
            
                6.50
             |                     
            
                2.08
             |                                 
            
                1,119,930
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/27/2012
             | 
            
                +0.30 / +4.92%
             |             
            
                6.30
             |           
            
                6.40
             |               
            
                6.20
             |                           
            
                6.40
             | 
            
                6.40
             |                     
            
                2.05
             |                                 
            
                912,100
             |            
            
                 
             |                                       
         
    
        
            | 
                4/26/2012
             | 
            
                +0.20 / +3.39%
             |             
            
                6.00
             |           
            
                6.10
             |               
            
                6.00
             |                           
            
                6.10
             | 
            
                6.10
             |                     
            
                1.95
             |                                 
            
                739,940
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/25/2012
             | 
            
                +0.20 / +3.51%
             |             
            
                5.80
             |           
            
                5.90
             |               
            
                5.80
             |                           
            
                5.90
             | 
            
                5.90
             |                     
            
                1.89
             |                                 
            
                381,790
             |            
            
                 
             |                                       
         
    
        
            | 
                4/24/2012
             | 
            
                +0.20 / +3.64%
             |             
            
                5.40
             |           
            
                5.70
             |               
            
                5.40
             |                           
            
                5.70
             | 
            
                5.70
             |                     
            
                1.82
             |                                 
            
                254,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/23/2012
             | 
            
                -0.20 / -3.51%
             |             
            
                5.60
             |           
            
                5.60
             |               
            
                5.50
             |                           
            
                5.50
             | 
            
                5.50
             |                     
            
                1.76
             |                                 
            
                529,100
             |            
            
                 
             |                                       
         
    
        
            | 
                4/20/2012
             | 
            
                -0.20 / -3.39%
             |             
            
                5.80
             |           
            
                5.90
             |               
            
                5.70
             |                           
            
                5.70
             | 
            
                5.70
             |                     
            
                1.82
             |                                 
            
                286,610
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/19/2012
             | 
            
                +0.20 / +3.51%
             |             
            
                5.90
             |           
            
                5.90
             |               
            
                5.80
             |                           
            
                5.90
             | 
            
                5.90
             |                     
            
                1.89
             |                                 
            
                965,400
             |            
            
                 
             |                                       
         
    
        
            | 
                4/18/2012
             | 
            
                +0.20 / +3.64%
             |             
            
                5.60
             |           
            
                5.70
             |               
            
                5.50
             |                           
            
                5.70
             | 
            
                5.70
             |                     
            
                1.82
             |                                 
            
                593,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/17/2012
             | 
            
                +0.20 / +3.77%
             |             
            
                5.30
             |           
            
                5.50
             |               
            
                5.30
             |                           
            
                5.50
             | 
            
                5.50
             |                     
            
                1.76
             |                                 
            
                660,430
             |            
            
                 
             |                                       
         
    
        
            | 
                4/16/2012
             | 
            
                +0.10 / +1.92%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.30
             | 
            
                5.30
             |                     
            
                1.69
             |                                 
            
                268,940
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/13/2012
             | 
            
                -0.10 / -1.89%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                1.66
             |                                 
            
                248,510
             |            
            
                 
             |                                       
         
    
        
            | 
                4/12/2012
             | 
            
                +0.10 / +1.92%
             |             
            
                5.30
             |           
            
                5.40
             |               
            
                5.20
             |                           
            
                5.30
             | 
            
                5.30
             |                     
            
                1.69
             |                                 
            
                234,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/11/2012
             | 
            
                +0.10 / +1.96%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                1.66
             |                                 
            
                243,510
             |            
            
                 
             |                                       
         
    
        
            | 
                4/10/2012
             | 
            
                -0.10 / -1.92%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                1.63
             |                                 
            
                62,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/9/2012
             | 
            
                +0.10 / +1.96%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                1.66
             |                                 
            
                92,220
             |            
            
                 
             |                                       
         
    
        
            | 
                4/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.00
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                1.63
             |                                 
            
                221,490
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/5/2012
             | 
            
                +0.10 / +2.00%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                1.63
             |                                 
            
                80,910
             |            
            
                 
             |                                       
         
    
        
            | 
                4/4/2012
             | 
            
                -0.10 / -1.96%
             |             
            
                5.20
             |           
            
                5.20
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                1.60
             |                                 
            
                94,610
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/3/2012
             | 
            
                +0.20 / +4.08%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                1.63
             |                                 
            
                258,220
             |            
            
                 
             |                                       
         
    
        
            | 
                3/30/2012
             | 
            
                -0.20 / -3.92%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                4.90
             | 
            
                4.90
             |                     
            
                1.57
             |                                 
            
                153,890
             |  
            
                 
             |                                                              
             
    
         
    
    
 |