| 
                 
                    Closing price on 4/25/2013
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    4.10 | 
                 
                
                    | High | 
                    4.20 | 
                 
                
                    | Low | 
                    4.00 | 
                     
                
                    | Volume | 
                    158,300 | 
                                 
                
                    | Split-adjusted Price | 
                    1.50 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VTO Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                4/25/2013
             | 
            
                -0.10 / -2.44%
             |             
            
                4.10
             |           
            
                4.20
             |               
            
                4.00
             |                           
            
                4.00
             | 
            
                4.00
             |                     
            
                1.50
             |                                 
            
                158,300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/24/2013
             | 
            
                -0.30 / -6.82%
             |             
            
                4.20
             |           
            
                4.20
             |               
            
                4.10
             |                           
            
                4.10
             | 
            
                4.10
             |                     
            
                1.54
             |                                 
            
                73,110
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/23/2013
             | 
            
                0.00 / 0.00%
             |             
            
                4.30
             |           
            
                4.50
             |               
            
                4.30
             |                           
            
                4.40
             | 
            
                4.40
             |                     
            
                1.54
             |                                 
            
                132,600
             |            
            
                 
             |                                       
         
    
        
            | 
                4/22/2013
             | 
            
                -0.20 / -4.35%
             |             
            
                4.30
             |           
            
                4.40
             |               
            
                4.30
             |                           
            
                4.40
             | 
            
                4.40
             |                     
            
                1.54
             |                                 
            
                274,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2013
             | 
            
                0.00 / 0.00%
             |             
            
                4.70
             |           
            
                4.70
             |               
            
                4.50
             |                           
            
                4.60
             | 
            
                4.60
             |                     
            
                1.61
             |                                 
            
                89,250
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2013
             | 
            
                0.00 / 0.00%
             |             
            
                4.60
             |           
            
                4.70
             |               
            
                4.50
             |                           
            
                4.60
             | 
            
                4.60
             |                     
            
                1.61
             |                                 
            
                40,850
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/16/2013
             | 
            
                +0.10 / +2.22%
             |             
            
                4.60
             |           
            
                4.60
             |               
            
                4.40
             |                           
            
                4.60
             | 
            
                4.60
             |                     
            
                1.61
             |                                 
            
                59,150
             |            
            
                 
             |                                       
         
    
        
            | 
                4/15/2013
             | 
            
                -0.20 / -4.26%
             |             
            
                4.60
             |           
            
                4.70
             |               
            
                4.50
             |                           
            
                4.50
             | 
            
                4.50
             |                     
            
                1.57
             |                                 
            
                414,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/12/2013
             | 
            
                0.00 / 0.00%
             |             
            
                4.80
             |           
            
                4.80
             |               
            
                4.60
             |                           
            
                4.70
             | 
            
                4.70
             |                     
            
                1.64
             |                                 
            
                42,140
             |            
            
                 
             |                                       
         
    
        
            | 
                4/11/2013
             | 
            
                -0.10 / -2.08%
             |             
            
                4.70
             |           
            
                4.80
             |               
            
                4.70
             |                           
            
                4.70
             | 
            
                4.70
             |                     
            
                1.64
             |                                 
            
                69,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/10/2013
             | 
            
                0.00 / 0.00%
             |             
            
                4.90
             |           
            
                4.90
             |               
            
                4.70
             |                           
            
                4.80
             | 
            
                4.80
             |                     
            
                1.68
             |                                 
            
                282,700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2013
             | 
            
                0.00 / 0.00%
             |             
            
                4.90
             |           
            
                4.90
             |               
            
                4.70
             |                           
            
                4.80
             | 
            
                4.80
             |                     
            
                1.68
             |                                 
            
                80,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/8/2013
             | 
            
                0.00 / 0.00%
             |             
            
                4.80
             |           
            
                4.90
             |               
            
                4.80
             |                           
            
                4.80
             | 
            
                4.80
             |                     
            
                1.68
             |                                 
            
                67,850
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2013
             | 
            
                -0.30 / -5.88%
             |             
            
                4.80
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                4.80
             | 
            
                4.80
             |                     
            
                1.68
             |                                 
            
                260,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/4/2013
             | 
            
                +0.10 / +2.00%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                4.80
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                1.78
             |                                 
            
                241,770
             |            
            
                 
             |                                       
         
    
        
            | 
                4/3/2013
             | 
            
                -0.10 / -1.96%
             |             
            
                5.10
             |           
            
                5.10
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                1.75
             |                                 
            
                56,390
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/2/2013
             | 
            
                +0.10 / +2.00%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                1.78
             |                                 
            
                383,310
             |            
            
                 
             |                                       
         
    
        
            | 
                4/1/2013
             | 
            
                0.00 / 0.00%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                1.75
             |                                 
            
                95,220
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/29/2013
             | 
            
                +0.10 / +2.04%
             |             
            
                4.90
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                1.75
             |                                 
            
                45,550
             |            
            
                 
             |                                       
         
    
        
            | 
                3/28/2013
             | 
            
                -0.10 / -2.00%
             |             
            
                5.00
             |           
            
                5.00
             |               
            
                4.90
             |                           
            
                4.90
             | 
            
                4.90
             |                     
            
                1.71
             |                                 
            
                37,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/27/2013
             | 
            
                0.00 / 0.00%
             |             
            
                4.90
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                1.75
             |                                 
            
                77,700
             |            
            
                 
             |                                       
         
    
        
            | 
                3/26/2013
             | 
            
                +0.10 / +2.04%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                1.75
             |                                 
            
                111,720
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/25/2013
             | 
            
                -0.10 / -2.00%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                4.90
             | 
            
                4.90
             |                     
            
                1.71
             |                                 
            
                89,870
             |            
            
                 
             |                                       
         
    
        
            | 
                3/22/2013
             | 
            
                -0.10 / -1.96%
             |             
            
                5.10
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                1.75
             |                                 
            
                281,210
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/21/2013
             | 
            
                -0.10 / -1.92%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.00
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                1.78
             |                                 
            
                109,610
             |            
            
                 
             |                                       
         
    
        
            | 
                3/20/2013
             | 
            
                +0.10 / +1.96%
             |             
            
                5.00
             |           
            
                5.30
             |               
            
                5.00
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                1.81
             |                                 
            
                57,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/19/2013
             | 
            
                +0.10 / +2.00%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.00
             |                           
            
                5.10
             | 
            
                5.10
             |                     
            
                1.78
             |                                 
            
                30,030
             |            
            
                 
             |                                       
         
    
        
            | 
                3/18/2013
             | 
            
                -0.30 / -5.66%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.00
             |                     
            
                1.75
             |                                 
            
                830,870
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/15/2013
             | 
            
                +0.10 / +1.92%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.20
             |                           
            
                5.30
             | 
            
                5.30
             |                     
            
                1.85
             |                                 
            
                8,790
             |            
            
                 
             |                                       
         
    
        
            | 
                3/14/2013
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                1.81
             |                                 
            
                49,990
             |  
            
                 
             |                                                              
             
    
         
    
    
 |