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                    Closing price on 5/18/2011
                 |  |  
    
        |           
                
                    | Open | 7.40 |  
                    | High | 7.70 |  
                    | Low | 7.40 |  
                    | Volume | 7,400 |  
                    | Split-adjusted Price | 4.97 |  
                
             | 
 |  DTT Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/18/2011 | 0.00 / 0.00% | 7.40 | 7.70 | 7.40 | 7.70 | 7.70 | 4.97 | 7,400 |   |  
            | 5/17/2011 | -0.40 / -4.94% | 8.10 | 8.10 | 7.70 | 7.70 | 7.70 | 4.97 | 20 |   |  			
            | 5/16/2011 | 0.00 / 0.00% | 8.10 | 8.10 | 8.10 | 8.10 | 8.10 | 5.22 | 500 |   |  
            | 5/13/2011 | -0.30 / -3.57% | 8.40 | 8.40 | 8.10 | 8.10 | 8.10 | 5.22 | 1,340 |   |  			
            | 5/12/2011 | -0.20 / -2.33% | 8.20 | 8.40 | 8.20 | 8.40 | 8.40 | 5.42 | 7,810 |   |  
            | 5/11/2011 | -0.10 / -1.15% | 8.30 | 8.60 | 8.30 | 8.60 | 8.60 | 5.55 | 3,520 |   |  			
            | 5/10/2011 | 0.00 / 0.00% | 8.70 | 8.70 | 8.70 | 8.70 | 8.70 | 5.61 | 0 |   |  
            | 5/9/2011 | +0.20 / +2.35% | 8.10 | 8.70 | 8.10 | 8.70 | 8.70 | 5.61 | 220 |   |  			
            | 5/6/2011 | -0.10 / -1.16% | 8.40 | 8.50 | 8.40 | 8.50 | 8.50 | 5.48 | 1,600 |   |  
            | 5/5/2011 | 0.00 / 0.00% | 8.20 | 8.60 | 8.20 | 8.60 | 8.60 | 5.55 | 5,920 |   |  			
            | 5/4/2011 | 0.00 / 0.00% | 8.30 | 8.60 | 8.20 | 8.60 | 8.60 | 5.55 | 8,330 |   |  
            | 4/29/2011 | 0.00 / 0.00% | 8.50 | 8.60 | 8.50 | 8.60 | 8.60 | 5.55 | 5,500 |   |  			
            | 4/28/2011 | 0.00 / 0.00% | 8.20 | 8.60 | 8.20 | 8.60 | 8.60 | 5.55 | 9,010 |   |  
            | 4/27/2011 | 0.00 / 0.00% | 8.40 | 8.60 | 8.20 | 8.60 | 8.60 | 5.55 | 9,700 |   |  			
            | 4/26/2011 | -0.10 / -1.15% | 8.40 | 8.60 | 8.30 | 8.60 | 8.60 | 5.55 | 7,810 |   |  
            | 4/25/2011 | +0.30 / +3.57% | 8.70 | 8.70 | 8.70 | 8.70 | 8.70 | 5.61 | 100 |   |  			
            | 4/22/2011 | -0.30 / -3.45% | 8.60 | 8.60 | 8.30 | 8.40 | 8.40 | 5.42 | 14,700 |   |  
            | 4/21/2011 | -0.10 / -1.14% | 8.70 | 8.80 | 8.40 | 8.70 | 8.70 | 5.61 | 13,710 |   |  			
            | 4/20/2011 | 0.00 / 0.00% | 8.40 | 8.80 | 8.40 | 8.80 | 8.80 | 5.68 | 4,780 |   |  
            | 4/19/2011 | -0.20 / -2.22% | 8.70 | 8.80 | 8.60 | 8.80 | 8.80 | 5.68 | 6,610 |   |  			
            | 4/18/2011 | +0.10 / +1.12% | 8.50 | 9.00 | 8.50 | 9.00 | 9.00 | 5.80 | 8,480 |   |  
            | 4/15/2011 | -0.10 / -1.11% | 8.90 | 8.90 | 8.70 | 8.90 | 8.90 | 5.74 | 9,650 |   |  			
            | 4/14/2011 | +0.30 / +3.45% | 8.80 | 9.00 | 8.80 | 9.00 | 9.00 | 5.80 | 2,000 |   |  
            | 4/13/2011 | 0.00 / 0.00% | 8.70 | 8.80 | 8.70 | 8.70 | 8.70 | 5.61 | 16,200 |   |  			
            | 4/8/2011 | -0.10 / -1.14% | 8.60 | 8.70 | 8.60 | 8.70 | 8.70 | 5.61 | 3,000 |   |  
            | 4/7/2011 | 0.00 / 0.00% | 8.70 | 8.80 | 8.70 | 8.80 | 8.80 | 5.68 | 2,260 |   |  			
            | 4/6/2011 | 0.00 / 0.00% | 8.80 | 8.80 | 8.80 | 8.80 | 8.80 | 5.68 | 1,000 |   |  
            | 4/5/2011 | 0.00 / 0.00% | 8.80 | 8.80 | 8.80 | 8.80 | 8.80 | 5.68 | 710 |   |  			
            | 4/4/2011 | 0.00 / 0.00% | 8.70 | 8.80 | 8.70 | 8.80 | 8.80 | 5.68 | 3,050 |   |  
            | 4/1/2011 | 0.00 / 0.00% | 8.70 | 8.80 | 8.70 | 8.80 | 8.80 | 5.68 | 5,200 |   |  |