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            | 
                    Closing price on 2/18/2011
                 |  |  
    
        |           
                
                    | Open | 9.10 |  
                    | High | 9.30 |  
                    | Low | 9.10 |  
                    | Volume | 23,210 |  
                    | Split-adjusted Price | 5.73 |  
                
             | 
 |  DTT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 2/18/2011 | -0.20 / -2.15% | 9.10 | 9.30 | 9.10 | 9.10 | 9.10 | 5.73 | 23,210 |   |  
            | 2/17/2011 | -0.20 / -2.11% | 9.40 | 9.40 | 9.20 | 9.30 | 9.30 | 5.85 | 5,560 |   |  			
            | 2/16/2011 | -0.10 / -1.04% | 9.40 | 9.50 | 9.30 | 9.50 | 9.50 | 5.98 | 12,220 |   |  
            | 2/15/2011 | 0.00 / 0.00% | 9.70 | 9.70 | 9.40 | 9.60 | 9.60 | 6.04 | 9,830 |   |  			
            | 2/14/2011 | +0.40 / +4.35% | 9.20 | 9.60 | 9.20 | 9.60 | 9.60 | 6.04 | 26,030 |   |  
            | 2/11/2011 | 0.00 / 0.00% | 9.30 | 9.30 | 9.20 | 9.20 | 9.20 | 5.79 | 5,140 |   |  			
            | 2/10/2011 | +0.10 / +1.10% | 9.20 | 9.20 | 9.00 | 9.20 | 9.20 | 5.79 | 16,910 |   |  
            | 2/9/2011 | -0.10 / -1.09% | 9.20 | 9.20 | 9.10 | 9.10 | 9.10 | 5.73 | 5,370 |   |  			
            | 2/8/2011 | +0.10 / +1.10% | 9.20 | 9.20 | 9.20 | 9.20 | 9.20 | 5.79 | 6,010 |   |  
            | 1/28/2011 | +0.10 / +1.11% | 9.20 | 9.20 | 9.10 | 9.10 | 9.10 | 5.73 | 59,000 |   |  			
            | 1/27/2011 | +0.10 / +1.12% | 9.20 | 9.20 | 9.00 | 9.00 | 9.00 | 5.66 | 3,150 |   |  
            | 1/26/2011 | -0.30 / -3.26% | 8.90 | 9.20 | 8.90 | 8.90 | 8.90 | 5.60 | 22,230 |   |  			
            | 1/25/2011 | +0.20 / +2.22% | 9.20 | 9.20 | 9.00 | 9.20 | 9.20 | 5.79 | 5,030 |   |  
            | 1/24/2011 | -0.30 / -3.23% | 9.10 | 9.20 | 9.00 | 9.00 | 9.00 | 5.66 | 21,630 |   |  			
            | 1/21/2011 | -0.10 / -1.06% | 9.40 | 9.40 | 9.20 | 9.30 | 9.30 | 5.85 | 11,860 |   |  
            | 1/20/2011 | +0.30 / +3.30% | 9.10 | 9.40 | 9.00 | 9.40 | 9.40 | 5.92 | 29,710 |   |  			
            | 1/19/2011 | -0.10 / -1.09% | 9.00 | 9.10 | 9.00 | 9.10 | 9.10 | 5.73 | 6,250 |   |  
            | 1/18/2011 | -0.10 / -1.08% | 9.30 | 9.30 | 9.10 | 9.20 | 9.20 | 5.79 | 11,960 |   |  			
            | 1/17/2011 | 0.00 / 0.00% | 9.00 | 9.30 | 9.00 | 9.30 | 9.30 | 5.85 | 6,620 |   |  
            | 1/14/2011 | +0.30 / +3.33% | 9.00 | 9.30 | 8.90 | 9.30 | 9.30 | 5.85 | 7,410 |   |  			
            | 1/13/2011 | +0.20 / +2.27% | 8.70 | 9.00 | 8.70 | 9.00 | 9.00 | 5.66 | 7,030 |   |  
            | 1/12/2011 | 0.00 / 0.00% | 8.70 | 9.00 | 8.70 | 8.80 | 8.80 | 5.54 | 16,450 |   |  			
            | 1/11/2011 | -0.20 / -2.22% | 8.80 | 8.80 | 8.80 | 8.80 | 8.80 | 5.54 | 3,230 |   |  
            | 1/10/2011 | +0.10 / +1.12% | 8.70 | 9.00 | 8.70 | 9.00 | 9.00 | 5.66 | 1,440 |   |  			
            | 1/7/2011 | -0.10 / -1.11% | 8.90 | 9.10 | 8.90 | 8.90 | 8.90 | 5.60 | 11,290 |   |  
            | 1/6/2011 | -0.20 / -2.17% | 9.10 | 9.10 | 9.00 | 9.00 | 9.00 | 5.66 | 8,730 |   |  			
            | 1/5/2011 | 0.00 / 0.00% | 9.10 | 9.20 | 9.00 | 9.20 | 9.20 | 5.79 | 6,340 |   |  
            | 1/4/2011 | 0.00 / 0.00% | 9.20 | 9.20 | 9.00 | 9.20 | 9.20 | 5.79 | 8,830 |   |  			
            | 12/31/2010 | 0.00 / 0.00% | 9.00 | 9.20 | 9.00 | 9.20 | 9.20 | 5.79 | 11,190 |   |  
            | 12/30/2010 | -0.10 / -1.08% | 8.90 | 9.50 | 8.90 | 9.20 | 9.20 | 5.79 | 16,530 |   |  |