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                    Closing price on 5/11/2012
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        |           
                
                    | Open | 37.00 |  
                    | High | 37.80 |  
                    | Low | 37.00 |  
                    | Volume | 4,650 |  
                    | Split-adjusted Price | 4.00 |  
                
             | 
 |  IMP Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/11/2012 | -0.20 / -0.53% | 37.00 | 37.80 | 37.00 | 37.70 | 37.70 | 4.00 | 4,650 |   |  
            | 5/10/2012 | 0.00 / 0.00% | 38.00 | 38.00 | 37.20 | 37.90 | 37.90 | 4.02 | 18,190 |   |  			
            | 5/9/2012 | +0.40 / +1.07% | 37.80 | 38.90 | 37.80 | 37.90 | 37.90 | 4.02 | 10,280 |   |  
            | 5/8/2012 | +0.10 / +0.27% | 37.20 | 37.80 | 37.20 | 37.50 | 37.50 | 3.98 | 15,560 |   |  			
            | 5/7/2012 | +0.30 / +0.81% | 37.00 | 37.40 | 37.00 | 37.40 | 37.40 | 3.97 | 14,720 |   |  
            | 5/4/2012 | -0.10 / -0.27% | 37.00 | 37.20 | 36.60 | 37.10 | 37.10 | 3.94 | 19,730 |   |  			
            | 5/3/2012 | +0.20 / +0.54% | 37.30 | 37.30 | 37.20 | 37.20 | 37.20 | 3.95 | 890 |   |  
            | 5/2/2012 | -0.80 / -2.12% | 37.20 | 37.20 | 37.00 | 37.00 | 37.00 | 3.93 | 5,080 |   |  			
            | 4/27/2012 | -0.10 / -0.26% | 37.60 | 37.80 | 37.60 | 37.80 | 37.80 | 4.01 | 10,740 |   |  
            | 4/26/2012 | 0.00 / 0.00% | 37.50 | 37.90 | 37.10 | 37.90 | 37.90 | 4.02 | 15,700 |   |  			
            | 4/25/2012 | -1.20 / -3.07% | 36.90 | 37.90 | 36.90 | 37.90 | 37.90 | 4.02 | 9,050 |   |  
            | 4/24/2012 | -0.30 / -0.76% | 39.40 | 39.40 | 38.50 | 39.10 | 39.10 | 3.91 | 19,900 |   |  			
            | 4/23/2012 | +0.20 / +0.51% | 39.40 | 39.40 | 39.20 | 39.40 | 39.40 | 3.94 | 12,780 |   |  
            | 4/20/2012 | 0.00 / 0.00% | 38.90 | 39.20 | 38.70 | 39.20 | 39.20 | 3.92 | 17,550 |   |  			
            | 4/19/2012 | +1.70 / +4.53% | 38.70 | 39.30 | 38.30 | 39.20 | 39.20 | 3.92 | 13,670 |   |  
            | 4/18/2012 | -1.30 / -3.35% | 39.70 | 39.70 | 37.50 | 37.50 | 37.50 | 3.75 | 59,800 |   |  			
            | 4/17/2012 | +0.10 / +0.26% | 38.70 | 40.00 | 38.70 | 38.80 | 38.80 | 3.88 | 46,110 |   |  
            | 4/16/2012 | +1.80 / +4.88% | 38.00 | 38.70 | 36.50 | 38.70 | 38.70 | 3.87 | 21,440 |   |  			
            | 4/13/2012 | -0.90 / -2.38% | 37.90 | 37.90 | 36.90 | 36.90 | 36.90 | 3.69 | 110,030 |   |  
            | 4/12/2012 | -0.20 / -0.53% | 37.00 | 38.00 | 37.00 | 37.80 | 37.80 | 3.78 | 18,380 |   |  			
            | 4/11/2012 | 0.00 / 0.00% | 37.10 | 38.00 | 37.00 | 38.00 | 38.00 | 3.80 | 22,580 |   |  
            | 4/10/2012 | +0.30 / +0.80% | 37.10 | 38.00 | 37.00 | 38.00 | 38.00 | 3.80 | 7,260 |   |  			
            | 4/9/2012 | +0.40 / +1.07% | 37.00 | 37.70 | 37.00 | 37.70 | 37.70 | 3.77 | 8,950 |   |  
            | 4/6/2012 | -0.20 / -0.53% | 38.00 | 38.00 | 36.50 | 37.30 | 37.30 | 3.73 | 12,260 |   |  			
            | 4/5/2012 | 0.00 / 0.00% | 38.00 | 38.00 | 36.70 | 37.50 | 37.50 | 3.75 | 2,810 |   |  
            | 4/4/2012 | 0.00 / 0.00% | 38.30 | 38.30 | 37.00 | 37.50 | 37.50 | 3.75 | 23,460 |   |  			
            | 4/3/2012 | -0.40 / -1.06% | 37.90 | 37.90 | 36.30 | 37.50 | 37.50 | 3.75 | 9,450 |   |  
            | 3/30/2012 | -0.10 / -0.26% | 38.00 | 38.00 | 37.50 | 37.90 | 37.90 | 3.79 | 1,050 |   |  			
            | 3/29/2012 | 0.00 / 0.00% | 38.30 | 38.30 | 38.00 | 38.00 | 38.00 | 3.80 | 2,050 |   |  
            | 3/28/2012 | 0.00 / 0.00% | 37.00 | 38.00 | 37.00 | 38.00 | 38.00 | 3.80 | 9,570 |   |  |