| 
    
        
            | 
                    Closing price on 4/20/2015
                 |  |  
    
        |           
                
                    | Open | 11.60 |  
                    | High | 12.70 |  
                    | Low | 11.60 |  
                    | Volume | 2,300 |  
                    | Split-adjusted Price | 7.72 |  
                
             | 
 |  NST Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 4/20/2015 | -0.30 / -2.34% | 11.60 | 12.70 | 11.60 | 12.50 | 11.69 | 7.72 | 2,300 |   |  
            | 4/17/2015 | +0.20 / +1.59% | 11.40 | 12.80 | 11.40 | 12.80 | 11.45 | 7.90 | 8,400 |   |  			
            | 4/16/2015 | +1.00 / +8.62% | 11.60 | 12.60 | 11.60 | 12.60 | 11.61 | 7.78 | 19,100 |   |  
            | 4/15/2015 | -1.20 / -9.38% | 11.60 | 12.80 | 11.60 | 11.60 | 11.62 | 7.16 | 6,300 |   |  			
            | 4/14/2015 | -1.40 / -9.86% | 12.80 | 15.00 | 12.80 | 12.80 | 13.10 | 7.90 | 3,600 |   |  
            | 4/13/2015 | +0.30 / +2.16% | 13.20 | 15.00 | 12.60 | 14.20 | 12.90 | 8.77 | 4,828 |   |  			
            | 4/10/2015 | 0.00 / 0.00% | 13.90 | 13.90 | 13.90 | 13.90 | 13.90 | 8.58 | 40 |   |  
            | 4/9/2015 | +1.20 / +9.45% | 13.90 | 13.90 | 13.90 | 13.90 | 13.90 | 8.58 | 200 |   |  			
            | 4/8/2015 | +1.10 / +9.48% | 12.50 | 12.70 | 12.50 | 12.70 | 12.60 | 7.84 | 200 |   |  
            | 4/7/2015 | -1.20 / -9.38% | 11.60 | 13.60 | 11.60 | 11.60 | 11.81 | 7.16 | 3,620 |   |  			
            | 4/6/2015 | 0.00 / 0.00% | 12.80 | 12.80 | 12.80 | 12.80 | 12.80 | 7.90 | 83 |   |  
            | 4/3/2015 | +0.60 / +4.92% | 12.80 | 12.80 | 12.80 | 12.80 | 12.80 | 7.90 | 100 |   |  			
            | 4/2/2015 | -1.30 / -9.63% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 300 |   |  
            | 4/1/2015 | +0.50 / +3.85% | 13.50 | 13.50 | 13.50 | 13.50 | 13.50 | 8.33 | 5,300 |   |  			
            | 3/31/2015 | 0.00 / 0.00% | 13.00 | 13.00 | 13.00 | 13.00 | 13.00 | 8.02 | 0 |   |  
            | 3/30/2015 | 0.00 / 0.00% | 13.00 | 13.00 | 13.00 | 13.00 | 13.00 | 8.02 | 0 |   |  			
            | 3/27/2015 | +0.80 / +6.56% | 11.20 | 13.00 | 11.20 | 13.00 | 11.62 | 8.02 | 6,700 |   |  
            | 3/26/2015 | 0.00 / 0.00% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 0 |   |  			
            | 3/25/2015 | 0.00 / 0.00% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 0 |   |  
            | 3/24/2015 | 0.00 / 0.00% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 0 |   |  			
            | 3/23/2015 | 0.00 / 0.00% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 0 |   |  
            | 3/20/2015 | 0.00 / 0.00% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 0 |   |  			
            | 3/19/2015 | 0.00 / 0.00% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 0 |   |  
            | 3/18/2015 | 0.00 / 0.00% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 0 |   |  			
            | 3/17/2015 | +0.30 / +2.52% | 12.20 | 12.20 | 12.20 | 12.20 | 12.20 | 7.53 | 100 |   |  
            | 3/16/2015 | +0.30 / +2.59% | 12.00 | 12.00 | 11.90 | 11.90 | 11.95 | 7.35 | 400 |   |  			
            | 3/13/2015 | -0.40 / -3.33% | 10.90 | 11.90 | 10.90 | 11.60 | 11.20 | 7.16 | 9,100 |   |  
            | 3/12/2015 | +0.60 / +5.26% | 12.20 | 12.20 | 12.00 | 12.00 | 12.20 | 7.41 | 500 |   |  			
            | 3/11/2015 | -0.60 / -5.00% | 10.80 | 11.50 | 10.80 | 11.40 | 11.15 | 7.04 | 400 |   |  
            | 3/10/2015 | +0.20 / +1.69% | 12.00 | 12.00 | 12.00 | 12.00 | 12.00 | 7.41 | 100 |   |  |