| 
                 
                    Closing price on 6/18/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    6.30 | 
                 
                
                    | High | 
                    6.60 | 
                 
                
                    | Low | 
                    6.30 | 
                     
                
                    | Volume | 
                    140,800 | 
                                 
                
                    | Split-adjusted Price | 
                    5.58 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
IVS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                6/18/2012
             | 
            
                0.00 / 0.00%
             |             
            
                6.30
             |           
            
                6.60
             |               
            
                6.30
             |                           
            
                6.50
             | 
            
                6.50
             |                     
            
                5.58
             |                                 
            
                140,800
             |            
            
                 
             |                                       
         
    
        
            | 
                6/15/2012
             | 
            
                0.00 / 0.00%
             |             
            
                6.50
             |           
            
                6.50
             |               
            
                6.40
             |                           
            
                6.50
             | 
            
                6.43
             |                     
            
                5.58
             |                                 
            
                113,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/14/2012
             | 
            
                0.00 / 0.00%
             |             
            
                6.50
             |           
            
                6.50
             |               
            
                6.30
             |                           
            
                6.50
             | 
            
                6.42
             |                     
            
                5.58
             |                                 
            
                431,000
             |            
            
                 
             |                                       
         
    
        
            | 
                6/13/2012
             | 
            
                0.00 / 0.00%
             |             
            
                6.60
             |           
            
                6.60
             |               
            
                6.30
             |                           
            
                6.50
             | 
            
                6.43
             |                     
            
                5.58
             |                                 
            
                118,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/12/2012
             | 
            
                -0.20 / -2.99%
             |             
            
                6.60
             |           
            
                6.70
             |               
            
                6.50
             |                           
            
                6.50
             | 
            
                6.58
             |                     
            
                5.58
             |                                 
            
                384,100
             |            
            
                 
             |                                       
         
    
        
            | 
                6/11/2012
             | 
            
                +0.20 / +3.08%
             |             
            
                6.50
             |           
            
                6.70
             |               
            
                6.40
             |                           
            
                6.70
             | 
            
                6.60
             |                     
            
                5.75
             |                                 
            
                171,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/8/2012
             | 
            
                -0.10 / -1.52%
             |             
            
                6.70
             |           
            
                6.80
             |               
            
                6.30
             |                           
            
                6.50
             | 
            
                6.63
             |                     
            
                5.58
             |                                 
            
                226,200
             |            
            
                 
             |                                       
         
    
        
            | 
                6/7/2012
             | 
            
                0.00 / 0.00%
             |             
            
                6.70
             |           
            
                6.80
             |               
            
                6.50
             |                           
            
                6.60
             | 
            
                6.61
             |                     
            
                5.67
             |                                 
            
                248,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/6/2012
             | 
            
                +0.10 / +1.54%
             |             
            
                6.60
             |           
            
                6.60
             |               
            
                6.40
             |                           
            
                6.60
             | 
            
                6.52
             |                     
            
                5.67
             |                                 
            
                293,400
             |            
            
                 
             |                                       
         
    
        
            | 
                6/5/2012
             | 
            
                +0.40 / +6.56%
             |             
            
                6.30
             |           
            
                6.50
             |               
            
                6.00
             |                           
            
                6.50
             | 
            
                6.28
             |                     
            
                5.58
             |                                 
            
                214,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/4/2012
             | 
            
                -0.20 / -3.17%
             |             
            
                6.50
             |           
            
                6.50
             |               
            
                6.10
             |                           
            
                6.10
             | 
            
                6.27
             |                     
            
                5.24
             |                                 
            
                177,000
             |            
            
                 
             |                                       
         
    
        
            | 
                6/1/2012
             | 
            
                -0.10 / -1.56%
             |             
            
                6.40
             |           
            
                6.50
             |               
            
                6.20
             |                           
            
                6.30
             | 
            
                6.41
             |                     
            
                5.41
             |                                 
            
                118,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/31/2012
             | 
            
                -0.10 / -1.54%
             |             
            
                6.50
             |           
            
                6.50
             |               
            
                6.20
             |                           
            
                6.40
             | 
            
                6.40
             |                     
            
                5.50
             |                                 
            
                169,200
             |            
            
                 
             |                                       
         
    
        
            | 
                5/30/2012
             | 
            
                -0.10 / -1.52%
             |             
            
                6.50
             |           
            
                6.60
             |               
            
                6.50
             |                           
            
                6.50
             | 
            
                6.55
             |                     
            
                5.58
             |                                 
            
                162,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/29/2012
             | 
            
                -0.10 / -1.49%
             |             
            
                6.60
             |           
            
                6.60
             |               
            
                6.40
             |                           
            
                6.60
             | 
            
                6.50
             |                     
            
                5.67
             |                                 
            
                147,900
             |            
            
                 
             |                                       
         
    
        
            | 
                5/28/2012
             | 
            
                +0.20 / +3.08%
             |             
            
                6.60
             |           
            
                6.80
             |               
            
                6.40
             |                           
            
                6.70
             | 
            
                6.63
             |                     
            
                5.75
             |                                 
            
                363,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/25/2012
             | 
            
                +0.10 / +1.56%
             |             
            
                6.20
             |           
            
                6.50
             |               
            
                6.20
             |                           
            
                6.50
             | 
            
                6.39
             |                     
            
                5.58
             |                                 
            
                356,900
             |            
            
                 
             |                                       
         
    
        
            | 
                5/24/2012
             | 
            
                0.00 / 0.00%
             |             
            
                6.40
             |           
            
                6.60
             |               
            
                6.00
             |                           
            
                6.40
             | 
            
                6.25
             |                     
            
                5.50
             |                                 
            
                291,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/23/2012
             | 
            
                -0.50 / -7.25%
             |             
            
                6.80
             |           
            
                6.80
             |               
            
                6.40
             |                           
            
                6.40
             | 
            
                6.68
             |                     
            
                5.50
             |                                 
            
                141,300
             |            
            
                 
             |                                       
         
    
        
            | 
                5/22/2012
             | 
            
                +0.10 / +1.47%
             |             
            
                6.90
             |           
            
                7.00
             |               
            
                6.70
             |                           
            
                6.90
             | 
            
                6.89
             |                     
            
                5.93
             |                                 
            
                553,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/21/2012
             | 
            
                +0.30 / +4.62%
             |             
            
                6.50
             |           
            
                6.80
             |               
            
                6.40
             |                           
            
                6.80
             | 
            
                6.63
             |                     
            
                5.84
             |                                 
            
                323,700
             |            
            
                 
             |                                       
         
    
        
            | 
                5/18/2012
             | 
            
                +0.10 / +1.56%
             |             
            
                6.80
             |           
            
                6.90
             |               
            
                6.30
             |                           
            
                6.50
             | 
            
                6.55
             |                     
            
                5.58
             |                                 
            
                328,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/17/2012
             | 
            
                -0.20 / -3.03%
             |             
            
                6.70
             |           
            
                7.00
             |               
            
                6.40
             |                           
            
                6.40
             | 
            
                6.71
             |                     
            
                5.50
             |                                 
            
                376,300
             |            
            
                 
             |                                       
         
    
        
            | 
                5/16/2012
             | 
            
                -0.10 / -1.49%
             |             
            
                6.70
             |           
            
                7.00
             |               
            
                6.40
             |                           
            
                6.60
             | 
            
                6.70
             |                     
            
                5.67
             |                                 
            
                344,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/15/2012
             | 
            
                -0.20 / -2.90%
             |             
            
                7.00
             |           
            
                7.10
             |               
            
                6.60
             |                           
            
                6.70
             | 
            
                6.86
             |                     
            
                5.75
             |                                 
            
                238,700
             |            
            
                 
             |                                       
         
    
        
            | 
                5/14/2012
             | 
            
                -0.50 / -6.76%
             |             
            
                7.40
             |           
            
                7.60
             |               
            
                6.90
             |                           
            
                6.90
             | 
            
                7.21
             |                     
            
                5.93
             |                                 
            
                260,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/11/2012
             | 
            
                -0.30 / -3.90%
             |             
            
                7.80
             |           
            
                7.90
             |               
            
                7.40
             |                           
            
                7.40
             | 
            
                7.65
             |                     
            
                6.35
             |                                 
            
                648,100
             |            
            
                 
             |                                       
         
    
        
            | 
                5/10/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.70
             |           
            
                7.90
             |               
            
                7.40
             |                           
            
                7.70
             | 
            
                7.72
             |                     
            
                6.61
             |                                 
            
                531,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/9/2012
             | 
            
                0.00 / 0.00%
             |             
            
                7.50
             |           
            
                7.70
             |               
            
                7.30
             |                           
            
                7.70
             | 
            
                7.52
             |                     
            
                6.61
             |                                 
            
                907,100
             |            
            
                 
             |                                       
         
    
        
            | 
                5/8/2012
             | 
            
                -0.10 / -1.28%
             |             
            
                7.80
             |           
            
                7.90
             |               
            
                7.30
             |                           
            
                7.70
             | 
            
                7.55
             |                     
            
                6.61
             |                                 
            
                373,800
             |  
            
                 
             |                                                              
             
    
         
    
    
 |