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                    Closing price on 9/20/2011
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        |           
                
                    | Open | 6.70 |  
                    | High | 6.80 |  
                    | Low | 6.60 |  
                    | Volume | 108,300 |  
                    | Split-adjusted Price | 5.84 |  
                
             | 
 |  IVS Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 9/20/2011 | +0.30 / +4.62% | 6.70 | 6.80 | 6.60 | 6.80 | 6.76 | 5.84 | 108,300 |   |  
            | 9/19/2011 | +0.20 / +3.17% | 6.20 | 6.50 | 6.20 | 6.50 | 6.41 | 5.58 | 79,200 |   |  			
            | 9/16/2011 | -0.10 / -1.56% | 6.60 | 6.60 | 6.00 | 6.30 | 6.14 | 5.41 | 2,600 |   |  
            | 9/15/2011 | -0.20 / -3.03% | 6.40 | 6.40 | 6.30 | 6.40 | 6.35 | 5.50 | 9,900 |   |  			
            | 9/14/2011 | +0.10 / +1.54% | 6.30 | 6.90 | 6.30 | 6.60 | 6.70 | 5.67 | 112,400 |   |  
            | 9/13/2011 | +0.10 / +1.56% | 6.50 | 6.60 | 6.40 | 6.50 | 6.52 | 5.58 | 85,100 |   |  			
            | 9/12/2011 | 0.00 / 0.00% | 6.30 | 6.50 | 6.00 | 6.40 | 6.21 | 5.50 | 129,600 |   |  
            | 9/9/2011 | 0.00 / 0.00% | 6.30 | 6.50 | 6.30 | 6.40 | 6.36 | 5.50 | 22,200 |   |  			
            | 9/8/2011 | -0.20 / -3.03% | 6.40 | 6.80 | 6.40 | 6.40 | 6.61 | 5.50 | 30,900 |   |  
            | 9/7/2011 | +0.30 / +4.76% | 6.60 | 6.60 | 6.20 | 6.60 | 6.44 | 5.67 | 103,500 |   |  			
            | 9/6/2011 | 0.00 / 0.00% | 6.70 | 6.70 | 5.90 | 6.30 | 6.33 | 5.41 | 77,700 |   |  
            | 9/5/2011 | +0.40 / +6.78% | 6.30 | 6.30 | 6.30 | 6.30 | 6.30 | 5.41 | 7,500 |   |  			
            | 9/1/2011 | +0.30 / +5.36% | 5.90 | 5.90 | 5.90 | 5.90 | 5.90 | 5.07 | 21,700 |   |  
            | 8/31/2011 | +0.30 / +5.66% | 5.60 | 5.60 | 5.60 | 5.60 | 5.60 | 4.81 | 47,200 |   |  			
            | 8/30/2011 | +0.30 / +6.00% | 5.30 | 5.30 | 5.30 | 5.30 | 5.30 | 4.55 | 28,300 |   |  
            | 8/29/2011 | +0.20 / +4.17% | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 4.29 | 600 |   |  			
            | 8/26/2011 | +0.40 / +9.09% | 4.80 | 4.80 | 4.50 | 4.80 | 4.72 | 4.12 | 39,900 |   |  
            | 8/25/2011 | -0.10 / -2.22% | 4.40 | 4.70 | 4.40 | 4.40 | 4.45 | 3.78 | 28,100 |   |  			
            | 8/24/2011 | +0.10 / +2.27% | 4.50 | 4.70 | 4.30 | 4.50 | 4.52 | 3.86 | 65,500 |   |  
            | 8/23/2011 | +0.20 / +4.76% | 4.30 | 4.40 | 4.30 | 4.40 | 4.40 | 3.78 | 139,100 |   |  			
            | 8/22/2011 | 0.00 / 0.00% | 4.10 | 4.30 | 4.10 | 4.20 | 4.24 | 3.61 | 44,200 |   |  
            | 8/19/2011 | -0.10 / -2.33% | 4.10 | 4.20 | 4.10 | 4.20 | 4.13 | 3.61 | 6,100 |   |  			
            | 8/18/2011 | 0.00 / 0.00% | 4.60 | 4.60 | 4.10 | 4.30 | 4.30 | 3.69 | 19,400 |   |  
            | 8/17/2011 | 0.00 / 0.00% | 4.20 | 4.40 | 4.20 | 4.30 | 4.28 | 3.69 | 22,600 |   |  			
            | 8/16/2011 | 0.00 / 0.00% | 4.20 | 4.40 | 4.10 | 4.30 | 4.16 | 3.69 | 19,500 |   |  
            | 8/15/2011 | -0.10 / -2.27% | 4.30 | 4.40 | 4.20 | 4.30 | 4.25 | 3.69 | 30,200 |   |  			
            | 8/12/2011 | -0.20 / -4.35% | 4.50 | 4.50 | 4.30 | 4.40 | 4.35 | 3.78 | 20,400 |   |  
            | 8/11/2011 | -0.30 / -6.12% | 4.60 | 4.60 | 4.60 | 4.60 | 4.60 | 3.95 | 5,500 |   |  			
            | 8/10/2011 | -0.20 / -3.92% | 5.50 | 5.50 | 4.90 | 4.90 | 4.93 | 4.21 | 5,800 |   |  
            | 8/9/2011 | -0.50 / -8.93% | 5.50 | 5.50 | 5.10 | 5.10 | 5.21 | 4.38 | 12,500 |   |  |