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                    Closing price on 5/13/2008
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        |           
                
                    | Open | 17.70 |  
                    | High | 17.70 |  
                    | Low | 17.70 |  
                    | Volume | 6,700 |  
                    | Split-adjusted Price | 12.94 |  
                
             | 
 |  XMC Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/13/2008 | +0.20 / +1.14% | 17.70 | 17.70 | 17.70 | 17.70 | 17.70 | 12.94 | 6,700 |   |  
            | 5/12/2008 | 0.00 / 0.00% | 18.50 | 18.50 | 17.50 | 17.50 | 18.18 | 12.79 | 14,700 |   |  			
            | 5/9/2008 | -0.50 / -2.78% | 17.50 | 18.50 | 17.50 | 17.50 | 18.04 | 12.79 | 11,200 |   |  
            | 5/8/2008 | -0.50 / -2.70% | 18.00 | 18.00 | 18.00 | 18.00 | 18.00 | 13.16 | 100 |   |  			
            | 5/7/2008 | -0.50 / -2.63% | 18.50 | 18.50 | 18.50 | 18.50 | 18.50 | 13.53 | 3,600 |   |  
            | 5/6/2008 | -0.40 / -2.06% | 19.40 | 19.40 | 19.00 | 19.00 | 19.03 | 13.89 | 1,200 |   |  			
            | 5/5/2008 | 0.00 / 0.00% | 20.60 | 20.60 | 19.40 | 19.40 | 19.53 | 14.18 | 3,100 |   |  
            | 4/29/2008 | -0.30 / -1.49% | 20.60 | 20.60 | 19.50 | 19.90 | 20.01 | 14.55 | 3,400 |   |  			
            | 4/28/2008 | 0.00 / 0.00% | 20.00 | 20.20 | 19.80 | 20.20 | 19.98 | 14.77 | 11,000 |   |  
            | 4/25/2008 | -0.60 / -2.96% | 20.30 | 20.30 | 19.70 | 19.70 | 19.96 | 14.40 | 7,000 |   |  			
            | 4/24/2008 | -0.60 / -2.87% | 20.30 | 20.30 | 20.30 | 20.30 | 20.30 | 14.84 | 12,900 |   |  
            | 4/23/2008 | -0.60 / -2.79% | 20.90 | 20.90 | 20.90 | 20.90 | 20.90 | 15.28 | 2,600 |   |  			
            | 4/22/2008 | -0.60 / -2.71% | 21.50 | 21.50 | 21.50 | 21.50 | 21.50 | 15.72 | 6,500 |   |  
            | 4/21/2008 | 0.00 / 0.00% | 22.20 | 22.20 | 22.10 | 22.10 | 22.10 | 16.16 | 2,500 |   |  			
            | 4/18/2008 | -1.20 / -5.17% | 23.10 | 23.10 | 22.00 | 22.00 | 22.68 | 16.08 | 22,800 |   |  
            | 4/17/2008 | +0.50 / +2.20% | 22.10 | 23.20 | 22.10 | 23.20 | 22.59 | 16.96 | 48,800 |   |  			
            | 4/16/2008 | 0.00 / 0.00% | 22.70 | 22.70 | 22.70 | 22.70 | 22.70 | 16.60 | 1,600 |   |  
            | 4/11/2008 | -0.70 / -2.92% | 23.30 | 23.30 | 23.30 | 23.30 | 23.30 | 17.04 | 32,100 |   |  			
            | 4/10/2008 | -0.70 / -2.83% | 24.00 | 24.00 | 24.00 | 24.00 | 24.00 | 17.55 | 6,800 |   |  
            | 4/9/2008 | -0.70 / -2.76% | 25.40 | 25.40 | 24.70 | 24.70 | 24.70 | 18.06 | 32,600 |   |  			
            | 4/8/2008 | +0.30 / +1.20% | 25.80 | 25.80 | 24.60 | 25.40 | 25.35 | 18.57 | 45,800 |   |  
            | 4/7/2008 | 0.00 / 0.00% | 25.10 | 25.10 | 25.10 | 25.10 | 25.10 | 18.35 | 26,800 |   |  			
            | 4/4/2008 | +0.40 / +1.67% | 24.40 | 24.40 | 24.40 | 24.40 | 24.40 | 17.84 | 14,400 |   |  
            | 4/3/2008 | +0.40 / +1.69% | 24.00 | 24.00 | 24.00 | 24.00 | 24.00 | 17.55 | 6,800 |   |  			
            | 4/2/2008 | +0.40 / +1.72% | 23.60 | 23.60 | 23.60 | 23.60 | 23.60 | 17.25 | 12,900 |   |  
            | 4/1/2008 | +0.40 / +1.75% | 23.20 | 23.20 | 23.20 | 23.20 | 23.20 | 16.96 | 12,600 |   |  			
            | 3/31/2008 | 0.00 / 0.00% | 22.80 | 22.80 | 22.80 | 22.80 | 22.80 | 16.67 | 2,100 |   |  
            | 3/28/2008 | +0.40 / +1.82% | 22.40 | 22.40 | 22.40 | 22.40 | 22.40 | 16.38 | 18,900 |   |  			
            | 3/27/2008 | +0.10 / +0.46% | 21.90 | 22.00 | 21.90 | 22.00 | 21.95 | 16.08 | 4,300 |   |  
            | 3/26/2008 | +1.90 / +9.50% | 20.00 | 22.20 | 20.00 | 21.90 | 21.65 | 16.01 | 23,900 |   |  |