| 
                 
                    Closing price on 5/22/2015
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    3.90 | 
                 
                
                    | High | 
                    4.00 | 
                 
                
                    | Low | 
                    3.90 | 
                     
                
                    | Volume | 
                    87,930 | 
                                 
                
                    | Split-adjusted Price | 
                    3.72 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VOS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/22/2015
             | 
            
                +0.10 / +2.56%
             |             
            
                3.90
             |           
            
                4.00
             |               
            
                3.90
             |                           
            
                4.00
             | 
            
                3.91
             |                     
            
                3.72
             |                                 
            
                87,930
             |            
            
                 
             |                                       
         
    
        
            | 
                5/21/2015
             | 
            
                0.00 / 0.00%
             |             
            
                3.90
             |           
            
                4.00
             |               
            
                3.90
             |                           
            
                3.90
             | 
            
                3.93
             |                     
            
                3.63
             |                                 
            
                58,520
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/20/2015
             | 
            
                +0.20 / +5.41%
             |             
            
                3.60
             |           
            
                3.90
             |               
            
                3.60
             |                           
            
                3.90
             | 
            
                3.79
             |                     
            
                3.63
             |                                 
            
                104,350
             |            
            
                 
             |                                       
         
    
        
            | 
                5/19/2015
             | 
            
                0.00 / 0.00%
             |             
            
                3.80
             |           
            
                3.80
             |               
            
                3.70
             |                           
            
                3.70
             | 
            
                3.73
             |                     
            
                3.44
             |                                 
            
                90,450
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/18/2015
             | 
            
                -0.20 / -5.13%
             |             
            
                3.70
             |           
            
                3.80
             |               
            
                3.70
             |                           
            
                3.70
             | 
            
                3.70
             |                     
            
                3.44
             |                                 
            
                240,720
             |            
            
                 
             |                                       
         
    
        
            | 
                5/15/2015
             | 
            
                -0.20 / -4.88%
             |             
            
                3.90
             |           
            
                4.00
             |               
            
                3.90
             |                           
            
                3.90
             | 
            
                3.93
             |                     
            
                3.63
             |                                 
            
                234,420
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/14/2015
             | 
            
                +0.20 / +5.13%
             |             
            
                4.00
             |           
            
                4.10
             |               
            
                3.90
             |                           
            
                4.10
             | 
            
                3.99
             |                     
            
                3.82
             |                                 
            
                110,200
             |            
            
                 
             |                                       
         
    
        
            | 
                5/13/2015
             | 
            
                -0.20 / -4.88%
             |             
            
                4.00
             |           
            
                4.00
             |               
            
                3.90
             |                           
            
                3.90
             | 
            
                3.99
             |                     
            
                3.63
             |                                 
            
                51,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/12/2015
             | 
            
                0.00 / 0.00%
             |             
            
                4.00
             |           
            
                4.10
             |               
            
                3.90
             |                           
            
                4.10
             | 
            
                4.02
             |                     
            
                3.82
             |                                 
            
                41,280
             |            
            
                 
             |                                       
         
    
        
            | 
                5/11/2015
             | 
            
                +0.20 / +5.13%
             |             
            
                3.90
             |           
            
                4.10
             |               
            
                3.90
             |                           
            
                4.10
             | 
            
                4.07
             |                     
            
                3.82
             |                                 
            
                153,030
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/8/2015
             | 
            
                +0.10 / +2.63%
             |             
            
                3.70
             |           
            
                4.00
             |               
            
                3.70
             |                           
            
                3.90
             | 
            
                3.81
             |                     
            
                3.63
             |                                 
            
                131,020
             |            
            
                 
             |                                       
         
    
        
            | 
                5/7/2015
             | 
            
                -0.10 / -2.56%
             |             
            
                3.90
             |           
            
                3.90
             |               
            
                3.80
             |                           
            
                3.80
             | 
            
                3.82
             |                     
            
                3.54
             |                                 
            
                90,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/6/2015
             | 
            
                -0.10 / -2.50%
             |             
            
                4.00
             |           
            
                4.00
             |               
            
                3.80
             |                           
            
                3.90
             | 
            
                3.85
             |                     
            
                3.63
             |                                 
            
                403,350
             |            
            
                 
             |                                       
         
    
        
            | 
                5/5/2015
             | 
            
                -0.20 / -4.76%
             |             
            
                4.00
             |           
            
                4.20
             |               
            
                4.00
             |                           
            
                4.00
             | 
            
                4.04
             |                     
            
                3.72
             |                                 
            
                265,370
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/4/2015
             | 
            
                -0.30 / -6.67%
             |             
            
                4.30
             |           
            
                4.30
             |               
            
                4.20
             |                           
            
                4.20
             | 
            
                4.22
             |                     
            
                3.91
             |                                 
            
                282,540
             |            
            
                 
             |                                       
         
    
        
            | 
                4/27/2015
             | 
            
                0.00 / 0.00%
             |             
            
                4.50
             |           
            
                4.50
             |               
            
                4.30
             |                           
            
                4.50
             | 
            
                4.40
             |                     
            
                4.19
             |                                 
            
                137,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/24/2015
             | 
            
                -0.10 / -2.17%
             |             
            
                4.60
             |           
            
                4.60
             |               
            
                4.40
             |                           
            
                4.50
             | 
            
                4.55
             |                     
            
                4.19
             |                                 
            
                110,390
             |            
            
                 
             |                                       
         
    
        
            | 
                4/23/2015
             | 
            
                +0.10 / +2.22%
             |             
            
                4.60
             |           
            
                4.60
             |               
            
                4.30
             |                           
            
                4.60
             | 
            
                4.44
             |                     
            
                4.28
             |                                 
            
                202,030
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/22/2015
             | 
            
                -0.20 / -4.26%
             |             
            
                4.50
             |           
            
                4.70
             |               
            
                4.50
             |                           
            
                4.50
             | 
            
                4.50
             |                     
            
                4.19
             |                                 
            
                236,700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/21/2015
             | 
            
                0.00 / 0.00%
             |             
            
                4.70
             |           
            
                4.80
             |               
            
                4.60
             |                           
            
                4.70
             | 
            
                4.67
             |                     
            
                4.37
             |                                 
            
                107,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/20/2015
             | 
            
                -0.20 / -4.08%
             |             
            
                4.80
             |           
            
                4.80
             |               
            
                4.70
             |                           
            
                4.70
             | 
            
                4.73
             |                     
            
                4.37
             |                                 
            
                112,960
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2015
             | 
            
                0.00 / 0.00%
             |             
            
                4.90
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                4.90
             | 
            
                4.82
             |                     
            
                4.56
             |                                 
            
                242,530
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/16/2015
             | 
            
                0.00 / 0.00%
             |             
            
                5.00
             |           
            
                5.00
             |               
            
                4.90
             |                           
            
                4.90
             | 
            
                4.98
             |                     
            
                4.56
             |                                 
            
                149,920
             |            
            
                 
             |                                       
         
    
        
            | 
                4/15/2015
             | 
            
                +0.10 / +2.08%
             |             
            
                4.90
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                4.90
             | 
            
                4.91
             |                     
            
                4.56
             |                                 
            
                314,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/14/2015
             | 
            
                -0.20 / -4.00%
             |             
            
                5.00
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                4.80
             | 
            
                4.91
             |                     
            
                4.47
             |                                 
            
                264,730
             |            
            
                 
             |                                       
         
    
        
            | 
                4/13/2015
             | 
            
                +0.10 / +2.04%
             |             
            
                4.80
             |           
            
                5.00
             |               
            
                4.80
             |                           
            
                5.00
             | 
            
                4.95
             |                     
            
                4.65
             |                                 
            
                247,310
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/10/2015
             | 
            
                +0.10 / +2.08%
             |             
            
                4.80
             |           
            
                4.90
             |               
            
                4.70
             |                           
            
                4.90
             | 
            
                4.81
             |                     
            
                4.56
             |                                 
            
                234,730
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2015
             | 
            
                +0.20 / +4.35%
             |             
            
                4.60
             |           
            
                4.80
             |               
            
                4.50
             |                           
            
                4.80
             | 
            
                4.66
             |                     
            
                4.47
             |                                 
            
                244,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/8/2015
             | 
            
                -0.10 / -2.13%
             |             
            
                4.70
             |           
            
                4.80
             |               
            
                4.50
             |                           
            
                4.60
             | 
            
                4.61
             |                     
            
                4.28
             |                                 
            
                45,980
             |            
            
                 
             |                                       
         
    
        
            | 
                4/7/2015
             | 
            
                +0.20 / +4.44%
             |             
            
                4.40
             |           
            
                4.70
             |               
            
                4.30
             |                           
            
                4.70
             | 
            
                4.45
             |                     
            
                4.37
             |                                 
            
                491,060
             |  
            
                 
             |                                                              
             
    
         
    
    
 |