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                    Closing price on 3/14/2011
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                    | Open | 71.00 |  
                    | High | 78.00 |  
                    | Low | 71.00 |  
                    | Volume | 8,880 |  
                    | Split-adjusted Price | 23.02 |  
                
             | 
 |  NBB Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 3/14/2011 | -3.50 / -4.70% | 71.00 | 78.00 | 71.00 | 71.00 | 71.00 | 23.02 | 8,880 |   |  
            | 3/11/2011 | -0.50 / -0.67% | 70.00 | 74.50 | 70.00 | 74.50 | 74.50 | 24.16 | 220 |   |  			
            | 3/10/2011 | 0.00 / 0.00% | 75.00 | 78.00 | 71.50 | 75.00 | 75.00 | 23.80 | 1,130 |   |  
            | 3/9/2011 | 0.00 / 0.00% | 75.00 | 75.00 | 75.00 | 75.00 | 75.00 | 23.80 | 310 |   |  			
            | 3/8/2011 | 0.00 / 0.00% | 75.00 | 75.00 | 75.00 | 75.00 | 75.00 | 23.80 | 0 |   |  
            | 3/7/2011 | 0.00 / 0.00% | 71.50 | 75.00 | 71.50 | 75.00 | 75.00 | 23.80 | 4,180 |   |  			
            | 3/4/2011 | -0.50 / -0.66% | 72.00 | 75.00 | 72.00 | 75.00 | 75.00 | 23.80 | 62,000 |   |  
            | 3/3/2011 | 0.00 / 0.00% | 75.50 | 75.50 | 75.50 | 75.50 | 75.50 | 23.96 | 0 |   |  			
            | 3/2/2011 | -0.50 / -0.66% | 75.50 | 75.50 | 75.50 | 75.50 | 75.50 | 23.96 | 510 |   |  
            | 3/1/2011 | 0.00 / 0.00% | 75.50 | 76.00 | 75.50 | 76.00 | 76.00 | 24.12 | 20,040 |   |  			
            | 2/28/2011 | +1.00 / +1.33% | 76.50 | 76.50 | 76.00 | 76.00 | 76.00 | 24.12 | 9,970 |   |  
            | 2/25/2011 | -3.00 / -3.85% | 74.50 | 75.00 | 74.50 | 75.00 | 75.00 | 23.80 | 1,030 |   |  			
            | 2/24/2011 | 0.00 / 0.00% | 78.00 | 78.00 | 78.00 | 78.00 | 78.00 | 24.75 | 10 |   |  
            | 2/23/2011 | +3.00 / +4.00% | 74.50 | 78.00 | 74.50 | 78.00 | 78.00 | 24.75 | 30,020 |   |  			
            | 2/22/2011 | +3.00 / +4.17% | 72.00 | 75.00 | 69.50 | 75.00 | 75.00 | 23.80 | 10,220 |   |  
            | 2/21/2011 | -3.50 / -4.64% | 79.00 | 79.00 | 72.00 | 72.00 | 72.00 | 22.85 | 9,530 |   |  			
            | 2/18/2011 | -3.50 / -4.43% | 75.50 | 79.00 | 75.50 | 75.50 | 75.50 | 23.96 | 1,430 |   |  
            | 2/17/2011 | -0.50 / -0.63% | 79.00 | 79.00 | 79.00 | 79.00 | 79.00 | 25.07 | 100 |   |  			
            | 2/16/2011 | -0.50 / -0.63% | 79.00 | 79.50 | 79.00 | 79.50 | 79.50 | 25.23 | 20,020 |   |  
            | 2/15/2011 | 0.00 / 0.00% | 76.00 | 80.00 | 76.00 | 80.00 | 80.00 | 25.39 | 620 |   |  			
            | 2/14/2011 | 0.00 / 0.00% | 80.00 | 80.00 | 80.00 | 80.00 | 80.00 | 25.39 | 6,100 |   |  
            | 2/11/2011 | -3.00 / -3.61% | 80.00 | 80.00 | 80.00 | 80.00 | 80.00 | 25.39 | 310 |   |  			
            | 2/10/2011 | 0.00 / 0.00% | 83.00 | 83.00 | 83.00 | 83.00 | 83.00 | 26.34 | 0 |   |  
            | 2/9/2011 | 0.00 / 0.00% | 83.00 | 83.00 | 83.00 | 83.00 | 83.00 | 26.34 | 0 |   |  			
            | 2/8/2011 | +2.00 / +2.47% | 83.00 | 83.00 | 83.00 | 83.00 | 83.00 | 26.34 | 90 |   |  
            | 1/28/2011 | +2.00 / +2.53% | 81.00 | 81.00 | 81.00 | 81.00 | 81.00 | 25.70 | 40 |   |  			
            | 1/27/2011 | -1.00 / -1.25% | 81.00 | 81.00 | 79.00 | 79.00 | 79.00 | 25.07 | 2,000 |   |  
            | 1/26/2011 | +1.00 / +1.27% | 82.50 | 82.50 | 80.00 | 80.00 | 80.00 | 25.39 | 1,120 |   |  			
            | 1/25/2011 | 0.00 / 0.00% | 78.50 | 79.00 | 78.50 | 79.00 | 79.00 | 25.07 | 18,400 |   |  
            | 1/24/2011 | -1.00 / -1.25% | 79.00 | 79.00 | 78.00 | 79.00 | 79.00 | 25.07 | 34,700 |   |  |