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                    Closing price on 5/12/2010
                 |  |  
    
        |           
                
                    | Open | 23.50 |  
                    | High | 23.50 |  
                    | Low | 23.10 |  
                    | Volume | 1,100 |  
                    | Split-adjusted Price | 11.58 |  
                
             | 
 |  NGC Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/12/2010 | +1.40 / +6.45% | 23.50 | 23.50 | 23.10 | 23.10 | 23.30 | 11.58 | 1,100 |   |  
            | 5/11/2010 | -1.80 / -7.66% | 23.70 | 23.70 | 21.70 | 21.70 | 23.44 | 10.88 | 2,300 |   |  			
            | 5/10/2010 | +1.00 / +4.44% | 23.20 | 23.50 | 23.00 | 23.50 | 23.24 | 11.78 | 10,600 |   |  
            | 5/7/2010 | 0.00 / 0.00% | 23.50 | 23.50 | 22.50 | 22.50 | 22.90 | 11.28 | 2,600 |   |  			
            | 5/6/2010 | +1.00 / +4.65% | 20.80 | 22.50 | 20.80 | 22.50 | 22.49 | 11.28 | 13,800 |   |  
            | 5/5/2010 | 0.00 / 0.00% | 21.00 | 21.50 | 21.00 | 21.50 | 21.06 | 10.78 | 3,400 |   |  			
            | 5/4/2010 | 0.00 / 0.00% | 21.50 | 21.50 | 21.50 | 21.50 | 21.50 | 10.78 | 0 |   |  
            | 4/29/2010 | 0.00 / 0.00% | 21.50 | 21.50 | 21.50 | 21.50 | 21.50 | 10.78 | 0 |   |  			
            | 4/28/2010 | -0.90 / -4.02% | 21.10 | 23.00 | 21.10 | 21.50 | 21.53 | 10.78 | 2,500 |   |  
            | 4/27/2010 | 0.00 / 0.00% | 22.40 | 22.40 | 22.40 | 22.40 | 22.40 | 11.23 | 0 |   |  			
            | 4/26/2010 | +0.80 / +3.70% | 22.40 | 22.40 | 22.40 | 22.40 | 22.40 | 11.23 | 0 |   |  
            | 4/22/2010 | -1.40 / -6.09% | 23.40 | 23.40 | 21.60 | 21.60 | 22.37 | 10.83 | 3,500 |   |  			
            | 4/21/2010 | +0.50 / +2.22% | 23.20 | 23.20 | 23.00 | 23.00 | 23.19 | 11.53 | 3,100 |   |  
            | 4/20/2010 | +0.30 / +1.35% | 22.50 | 22.50 | 22.00 | 22.50 | 22.28 | 11.28 | 2,300 |   |  			
            | 4/19/2010 | +0.10 / +0.45% | 21.50 | 22.20 | 21.50 | 22.20 | 21.94 | 11.13 | 1,600 |   |  
            | 4/16/2010 | +1.10 / +5.24% | 22.00 | 22.10 | 21.00 | 22.10 | 21.49 | 11.08 | 3,200 |   |  			
            | 4/15/2010 | +0.50 / +2.44% | 20.60 | 21.00 | 20.60 | 21.00 | 20.96 | 10.53 | 1,100 |   |  
            | 4/14/2010 | -0.70 / -3.30% | 20.50 | 20.50 | 20.50 | 20.50 | 20.50 | 10.28 | 2,000 |   |  			
            | 4/13/2010 | -1.30 / -5.78% | 21.20 | 21.20 | 21.20 | 21.20 | 21.20 | 10.63 | 400 |   |  
            | 4/12/2010 | +1.30 / +6.13% | 22.50 | 22.50 | 22.50 | 22.50 | 22.50 | 11.28 | 2,000 |   |  			
            | 4/9/2010 | -0.70 / -3.20% | 23.40 | 23.40 | 21.00 | 21.20 | 21.10 | 10.63 | 4,800 |   |  
            | 4/8/2010 | 0.00 / 0.00% | 21.90 | 21.90 | 21.90 | 21.90 | 21.90 | 10.98 | 0 |   |  			
            | 4/7/2010 | +0.90 / +4.29% | 21.90 | 21.90 | 21.90 | 21.90 | 21.90 | 10.98 | 0 |   |  
            | 4/6/2010 | 0.00 / 0.00% | 22.20 | 22.20 | 21.00 | 21.00 | 21.86 | 10.53 | 1,300 |   |  			
            | 4/5/2010 | -1.00 / -4.55% | 20.50 | 21.00 | 20.50 | 21.00 | 20.84 | 10.53 | 800 |   |  
            | 4/2/2010 | -0.50 / -2.22% | 22.00 | 22.00 | 22.00 | 22.00 | 22.00 | 11.03 | 100 |   |  			
            | 4/1/2010 | +1.00 / +4.65% | 21.00 | 22.50 | 20.50 | 22.50 | 21.00 | 11.28 | 500 |   |  
            | 3/31/2010 | 0.00 / 0.00% | 21.50 | 21.50 | 21.50 | 21.50 | 21.50 | 10.78 | 100 |   |  			
            | 3/30/2010 | 0.00 / 0.00% | 21.50 | 21.50 | 21.50 | 21.50 | 21.50 | 10.78 | 0 |   |  
            | 3/29/2010 | 0.00 / 0.00% | 21.50 | 21.50 | 21.50 | 21.50 | 21.50 | 10.78 | 0 |   |  |