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                    Closing price on 6/11/2009
                 |  |  
    
        |           
                
                    | Open | 17.80 |  
                    | High | 17.90 |  
                    | Low | 17.80 |  
                    | Volume | 163,340 |  
                    | Split-adjusted Price | 8.67 |  
                
             | 
 |  DTT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 6/11/2009 | +0.80 / +4.68% | 17.80 | 17.90 | 17.80 | 17.90 | 17.90 | 8.67 | 163,340 |   |  
            | 6/10/2009 | -0.80 / -4.47% | 17.10 | 17.10 | 17.10 | 17.10 | 17.10 | 8.28 | 101,760 |   |  			
            | 6/9/2009 | +0.80 / +4.68% | 17.90 | 17.90 | 17.00 | 17.90 | 17.90 | 8.67 | 346,310 |   |  
            | 6/8/2009 | +0.80 / +4.91% | 17.10 | 17.10 | 17.10 | 17.10 | 17.10 | 8.28 | 8,450 |   |  			
            | 6/5/2009 | +0.70 / +4.49% | 16.30 | 16.30 | 16.30 | 16.30 | 16.30 | 7.90 | 11,600 |   |  
            | 6/4/2009 | +0.70 / +4.70% | 15.60 | 15.60 | 15.60 | 15.60 | 15.60 | 7.56 | 9,650 |   |  			
            | 6/3/2009 | +0.70 / +4.93% | 14.90 | 14.90 | 14.90 | 14.90 | 14.90 | 7.22 | 25,320 |   |  
            | 6/2/2009 | +0.60 / +4.41% | 14.20 | 14.20 | 14.20 | 14.20 | 14.20 | 6.88 | 22,700 |   |  			
            | 6/1/2009 | +0.60 / +4.62% | 13.60 | 13.60 | 13.60 | 13.60 | 13.60 | 6.59 | 165,860 |   |  
            | 5/29/2009 | 0.00 / 0.00% | 13.40 | 13.40 | 13.00 | 13.00 | 13.00 | 6.30 | 43,830 |   |  			
            | 5/28/2009 | -0.30 / -2.26% | 13.30 | 13.30 | 12.70 | 13.00 | 13.00 | 6.30 | 54,910 |   |  
            | 5/27/2009 | -0.70 / -5.00% | 13.50 | 14.00 | 13.30 | 13.30 | 13.30 | 6.44 | 91,670 |   |  			
            | 5/26/2009 | +0.10 / +0.72% | 14.20 | 14.20 | 13.80 | 14.00 | 14.00 | 6.78 | 88,530 |   |  
            | 5/25/2009 | +0.60 / +4.51% | 13.30 | 13.90 | 12.70 | 13.90 | 13.90 | 6.73 | 132,810 |   |  			
            | 5/22/2009 | +0.50 / +3.91% | 13.40 | 13.40 | 12.40 | 13.30 | 13.30 | 6.44 | 360,630 |   |  
            | 5/21/2009 | +0.60 / +4.92% | 12.80 | 12.80 | 12.80 | 12.80 | 12.80 | 6.20 | 71,960 |   |  			
            | 5/20/2009 | +0.50 / +4.27% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 5.91 | 33,770 |   |  
            | 5/19/2009 | +0.50 / +4.46% | 11.70 | 11.70 | 11.70 | 11.70 | 11.70 | 5.67 | 15,390 |   |  			
            | 5/18/2009 | +0.50 / +4.67% | 11.00 | 11.20 | 10.80 | 11.20 | 11.20 | 5.43 | 83,260 |   |  
            | 5/15/2009 | +0.40 / +3.88% | 10.50 | 10.70 | 10.30 | 10.70 | 10.70 | 5.18 | 64,540 |   |  			
            | 5/14/2009 | +0.40 / +4.04% | 10.50 | 10.50 | 10.00 | 10.30 | 10.30 | 4.99 | 29,290 |   |  
            | 5/13/2009 | -0.50 / -4.81% | 10.60 | 10.60 | 9.90 | 9.90 | 9.90 | 4.80 | 25,190 |   |  			
            | 5/12/2009 | +0.20 / +1.96% | 10.20 | 10.40 | 10.10 | 10.40 | 10.40 | 5.04 | 19,920 |   |  
            | 5/11/2009 | +0.20 / +2.00% | 10.20 | 10.20 | 10.00 | 10.20 | 10.20 | 4.94 | 21,870 |   |  			
            | 5/8/2009 | +0.20 / +2.04% | 9.80 | 10.00 | 9.80 | 10.00 | 10.00 | 4.84 | 8,830 |   |  
            | 5/7/2009 | -0.60 / -5.77% | 9.80 | 10.30 | 9.80 | 9.80 | 9.80 | 4.75 | 29,570 |   |  			
            | 5/6/2009 | -0.10 / -0.95% | 10.00 | 10.70 | 10.00 | 10.40 | 10.34 | 5.04 | 7,330 |   |  
            | 5/5/2009 | 0.00 / 0.00% | 10.90 | 11.00 | 10.50 | 10.50 | 10.50 | 5.09 | 45,160 |   |  			
            | 5/4/2009 | +0.50 / +5.00% | 10.30 | 10.50 | 10.30 | 10.50 | 10.50 | 5.09 | 47,240 |   |  
            | 4/29/2009 | +0.30 / +3.09% | 10.00 | 10.10 | 9.60 | 10.00 | 10.00 | 4.84 | 15,120 |   |  |