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                    Closing price on 10/16/2009
                 |  |  
    
        |           
                
                    | Open | 81.00 |  
                    | High | 83.00 |  
                    | Low | 79.50 |  
                    | Volume | 155,320 |  
                    | Split-adjusted Price | 24.72 |  
                
             | 
 |  NBB Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 10/16/2009 | -2.50 / -3.05% | 81.00 | 83.00 | 79.50 | 79.50 | 79.50 | 24.72 | 155,320 |   |  
            | 10/15/2009 | +2.00 / +2.50% | 82.00 | 84.00 | 82.00 | 82.00 | 82.00 | 25.49 | 127,080 |   |  			
            | 10/14/2009 | 0.00 / 0.00% | 80.00 | 81.00 | 79.50 | 80.00 | 80.00 | 24.87 | 116,140 |   |  
            | 10/13/2009 | +2.00 / +2.56% | 79.50 | 80.00 | 76.00 | 80.00 | 80.00 | 24.87 | 107,870 |   |  			
            | 10/12/2009 | +3.50 / +4.70% | 77.00 | 78.00 | 77.00 | 78.00 | 78.00 | 24.25 | 126,390 |   |  
            | 10/9/2009 | +1.00 / +1.36% | 74.50 | 75.00 | 73.50 | 74.50 | 74.50 | 23.16 | 111,030 |   |  			
            | 10/8/2009 | +0.50 / +0.68% | 74.00 | 74.00 | 73.00 | 73.50 | 73.50 | 22.85 | 84,790 |   |  
            | 10/7/2009 | +2.50 / +3.55% | 72.00 | 73.00 | 69.50 | 73.00 | 73.00 | 22.69 | 201,690 |   |  			
            | 10/6/2009 | +0.50 / +0.71% | 73.00 | 73.00 | 70.00 | 70.50 | 70.50 | 21.92 | 187,570 |   |  
            | 10/5/2009 | -1.00 / -1.41% | 71.00 | 71.50 | 69.00 | 70.00 | 70.00 | 21.76 | 99,890 |   |  			
            | 10/2/2009 | +0.50 / +0.71% | 70.00 | 71.00 | 67.50 | 71.00 | 71.00 | 22.07 | 493,380 |   |  
            | 10/1/2009 | -3.50 / -4.73% | 74.00 | 74.00 | 70.50 | 70.50 | 70.50 | 21.92 | 261,940 |   |  			
            | 9/30/2009 | +0.50 / +0.68% | 76.50 | 77.00 | 74.00 | 74.00 | 74.00 | 23.01 | 292,650 |   |  
            | 9/29/2009 | +3.50 / +5.00% | 70.50 | 73.50 | 70.50 | 73.50 | 73.50 | 22.85 | 211,370 |   |  			
            | 9/28/2009 | +2.50 / +3.70% | 68.00 | 70.50 | 67.00 | 70.00 | 70.00 | 21.76 | 232,880 |   |  
            | 9/25/2009 | +2.00 / +3.05% | 64.00 | 68.00 | 64.00 | 67.50 | 67.50 | 20.98 | 103,610 |   |  			
            | 9/24/2009 | -1.00 / -1.50% | 66.00 | 67.00 | 64.50 | 65.50 | 65.50 | 20.36 | 205,300 |   |  
            | 9/23/2009 | -0.50 / -0.75% | 69.00 | 69.50 | 65.00 | 66.50 | 66.50 | 20.67 | 248,940 |   |  			
            | 9/22/2009 | +3.00 / +4.69% | 64.50 | 67.00 | 64.00 | 67.00 | 67.00 | 20.83 | 359,790 |   |  
            | 9/21/2009 | +3.00 / +4.92% | 63.00 | 64.00 | 62.00 | 64.00 | 64.00 | 19.90 | 147,370 |   |  			
            | 9/18/2009 | +1.50 / +2.52% | 60.00 | 62.00 | 59.00 | 61.00 | 61.00 | 18.96 | 157,800 |   |  
            | 9/17/2009 | 0.00 / 0.00% | 58.50 | 60.00 | 58.50 | 59.50 | 59.50 | 18.50 | 117,910 |   |  			
            | 9/16/2009 | -1.50 / -2.46% | 61.00 | 61.00 | 59.50 | 59.50 | 59.50 | 18.50 | 157,220 |   |  
            | 9/15/2009 | -1.00 / -1.61% | 62.00 | 62.00 | 59.00 | 61.00 | 61.00 | 18.96 | 196,940 |   |  			
            | 9/14/2009 | -0.50 / -0.80% | 62.50 | 64.50 | 62.00 | 62.00 | 62.00 | 19.27 | 162,880 |   |  
            | 9/11/2009 | +2.00 / +3.31% | 61.50 | 63.50 | 61.00 | 62.50 | 62.50 | 19.43 | 175,860 |   |  			
            | 9/10/2009 | +2.50 / +4.31% | 57.00 | 60.50 | 57.00 | 60.50 | 60.50 | 18.81 | 491,260 |   |  
            | 9/9/2009 | +0.50 / +0.87% | 58.00 | 58.50 | 57.50 | 58.00 | 58.00 | 18.03 | 126,430 |   |  			
            | 9/8/2009 | 0.00 / 0.00% | 58.50 | 58.50 | 57.00 | 57.50 | 57.50 | 17.88 | 52,250 |   |  
            | 9/7/2009 | +1.50 / +2.68% | 57.00 | 57.50 | 55.00 | 57.50 | 57.50 | 17.88 | 179,870 |   |  |