| 
                 
                    Closing price on 2/29/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    6.70 | 
                 
                
                    | High | 
                    6.70 | 
                 
                
                    | Low | 
                    5.90 | 
                     
                
                    | Volume | 
                    112,500 | 
                                 
                
                    | Split-adjusted Price | 
                    5.07 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
IVS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                2/29/2012
             | 
            
                -0.60 / -9.23%
             |             
            
                6.70
             |           
            
                6.70
             |               
            
                5.90
             |                           
            
                5.90
             | 
            
                6.44
             |                     
            
                5.07
             |                                 
            
                112,500
             |            
            
                 
             |                                       
         
    
        
            | 
                2/28/2012
             | 
            
                +0.40 / +6.56%
             |             
            
                6.60
             |           
            
                6.60
             |               
            
                5.80
             |                           
            
                6.50
             | 
            
                6.35
             |                     
            
                5.58
             |                                 
            
                175,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/27/2012
             | 
            
                +0.60 / +10.91%
             |             
            
                6.30
             |           
            
                6.30
             |               
            
                5.50
             |                           
            
                6.10
             | 
            
                6.18
             |                     
            
                5.24
             |                                 
            
                365,700
             |            
            
                 
             |                                       
         
    
        
            | 
                2/24/2012
             | 
            
                +0.10 / +1.85%
             |             
            
                6.20
             |           
            
                6.30
             |               
            
                5.50
             |                           
            
                5.50
             | 
            
                5.92
             |                     
            
                4.72
             |                                 
            
                57,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/23/2012
             | 
            
                +0.10 / +1.89%
             |             
            
                6.00
             |           
            
                6.00
             |               
            
                5.40
             |                           
            
                5.40
             | 
            
                5.86
             |                     
            
                4.64
             |                                 
            
                41,400
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2012
             | 
            
                +0.30 / +6.00%
             |             
            
                5.20
             |           
            
                5.80
             |               
            
                5.20
             |                           
            
                5.30
             | 
            
                5.69
             |                     
            
                4.55
             |                                 
            
                156,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/21/2012
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.60
             |               
            
                5.00
             |                           
            
                5.00
             | 
            
                5.47
             |                     
            
                4.29
             |                                 
            
                115,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/20/2012
             | 
            
                +0.20 / +4.17%
             |             
            
                4.90
             |           
            
                5.30
             |               
            
                4.90
             |                           
            
                5.00
             | 
            
                5.26
             |                     
            
                4.29
             |                                 
            
                233,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/17/2012
             | 
            
                +0.40 / +9.09%
             |             
            
                4.70
             |           
            
                5.10
             |               
            
                4.60
             |                           
            
                4.80
             | 
            
                4.98
             |                     
            
                4.12
             |                                 
            
                134,300
             |            
            
                 
             |                                       
         
    
        
            | 
                2/16/2012
             | 
            
                +0.20 / +4.76%
             |             
            
                4.60
             |           
            
                5.00
             |               
            
                4.40
             |                           
            
                4.40
             | 
            
                4.81
             |                     
            
                3.78
             |                                 
            
                93,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/15/2012
             | 
            
                -0.30 / -6.67%
             |             
            
                4.40
             |           
            
                4.80
             |               
            
                4.20
             |                           
            
                4.20
             | 
            
                4.70
             |                     
            
                3.61
             |                                 
            
                77,400
             |            
            
                 
             |                                       
         
    
        
            | 
                2/14/2012
             | 
            
                0.00 / 0.00%
             |             
            
                4.50
             |           
            
                4.50
             |               
            
                4.50
             |                           
            
                4.50
             | 
            
                4.50
             |                     
            
                3.86
             |                                 
            
                300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/13/2012
             | 
            
                -0.10 / -2.17%
             |             
            
                4.50
             |           
            
                4.90
             |               
            
                4.40
             |                           
            
                4.50
             | 
            
                4.80
             |                     
            
                3.86
             |                                 
            
                108,700
             |            
            
                 
             |                                       
         
    
        
            | 
                2/10/2012
             | 
            
                0.00 / 0.00%
             |             
            
                4.60
             |           
            
                4.60
             |               
            
                4.60
             |                           
            
                4.60
             | 
            
                4.60
             |                     
            
                3.95
             |                                 
            
                100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/9/2012
             | 
            
                -0.30 / -6.12%
             |             
            
                4.80
             |           
            
                5.00
             |               
            
                4.60
             |                           
            
                4.60
             | 
            
                4.90
             |                     
            
                3.95
             |                                 
            
                22,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/8/2012
             | 
            
                +0.40 / +8.89%
             |             
            
                4.60
             |           
            
                4.90
             |               
            
                4.60
             |                           
            
                4.90
             | 
            
                4.86
             |                     
            
                4.21
             |                                 
            
                86,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/7/2012
             | 
            
                -0.10 / -2.17%
             |             
            
                4.80
             |           
            
                5.00
             |               
            
                4.50
             |                           
            
                4.50
             | 
            
                4.87
             |                     
            
                3.86
             |                                 
            
                17,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/6/2012
             | 
            
                +0.10 / +2.22%
             |             
            
                4.70
             |           
            
                4.80
             |               
            
                4.60
             |                           
            
                4.60
             | 
            
                4.78
             |                     
            
                3.95
             |                                 
            
                25,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/3/2012
             | 
            
                +0.30 / +7.14%
             |             
            
                4.50
             |           
            
                4.50
             |               
            
                4.50
             |                           
            
                4.50
             | 
            
                4.50
             |                     
            
                3.86
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                2/2/2012
             | 
            
                +0.10 / +2.44%
             |             
            
                4.10
             |           
            
                4.30
             |               
            
                4.10
             |                           
            
                4.20
             | 
            
                4.29
             |                     
            
                3.61
             |                                 
            
                20,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/1/2012
             | 
            
                -0.40 / -8.89%
             |             
            
                4.10
             |           
            
                4.10
             |               
            
                4.10
             |                           
            
                4.10
             | 
            
                4.10
             |                     
            
                3.52
             |                                 
            
                1,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/31/2012
             | 
            
                -0.10 / -2.17%
             |             
            
                4.20
             |           
            
                4.50
             |               
            
                4.20
             |                           
            
                4.50
             | 
            
                4.37
             |                     
            
                3.86
             |                                 
            
                15,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/30/2012
             | 
            
                +0.20 / +4.55%
             |             
            
                4.30
             |           
            
                4.60
             |               
            
                4.30
             |                           
            
                4.60
             | 
            
                4.52
             |                     
            
                3.95
             |                                 
            
                20,700
             |            
            
                 
             |                                       
         
    
        
            | 
                1/20/2012
             | 
            
                +0.20 / +4.76%
             |             
            
                4.20
             |           
            
                4.40
             |               
            
                4.00
             |                           
            
                4.40
             | 
            
                4.27
             |                     
            
                3.78
             |                                 
            
                59,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/19/2012
             | 
            
                0.00 / 0.00%
             |             
            
                4.10
             |           
            
                4.20
             |               
            
                4.10
             |                           
            
                4.20
             | 
            
                4.18
             |                     
            
                3.61
             |                                 
            
                93,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/18/2012
             | 
            
                0.00 / 0.00%
             |             
            
                4.20
             |           
            
                4.20
             |               
            
                4.00
             |                           
            
                4.20
             | 
            
                4.13
             |                     
            
                3.61
             |                                 
            
                5,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/17/2012
             | 
            
                +0.20 / +5.00%
             |             
            
                4.10
             |           
            
                4.20
             |               
            
                4.10
             |                           
            
                4.20
             | 
            
                4.15
             |                     
            
                3.61
             |                                 
            
                2,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/16/2012
             | 
            
                +0.10 / +2.56%
             |             
            
                4.00
             |           
            
                4.10
             |               
            
                4.00
             |                           
            
                4.00
             | 
            
                4.04
             |                     
            
                3.43
             |                                 
            
                7,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/13/2012
             | 
            
                -0.20 / -4.88%
             |             
            
                4.00
             |           
            
                4.10
             |               
            
                3.80
             |                           
            
                3.90
             | 
            
                3.94
             |                     
            
                3.35
             |                                 
            
                10,900
             |            
            
                 
             |                                       
         
    
        
            | 
                1/12/2012
             | 
            
                +0.10 / +2.50%
             |             
            
                3.80
             |           
            
                4.10
             |               
            
                3.80
             |                           
            
                4.10
             | 
            
                3.93
             |                     
            
                3.52
             |                                 
            
                20,200
             |  
            
                 
             |                                                              
             
    
         
    
    
 |