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            | 
                    Closing price on 4/13/2018
                 |  |  
    
        |           
                
                    | Open | 15.20 |  
                    | High | 15.40 |  
                    | Low | 15.10 |  
                    | Volume | 51,300 |  
                    | Split-adjusted Price | 9.40 |  
                
             | 
 |  NAF Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 4/13/2018 | -0.10 / -0.66% | 15.20 | 15.40 | 15.10 | 15.10 | 15.20 | 9.40 | 51,300 |   |  
            | 4/12/2018 | +0.20 / +1.33% | 15.00 | 15.40 | 15.00 | 15.20 | 15.17 | 9.46 | 64,920 |   |  			
            | 4/11/2018 | -0.10 / -0.66% | 15.10 | 15.20 | 15.00 | 15.00 | 15.06 | 9.33 | 49,790 |   |  
            | 4/10/2018 | -0.10 / -0.66% | 15.20 | 15.25 | 15.00 | 15.10 | 15.15 | 9.40 | 58,680 |   |  			
            | 4/9/2018 | +0.10 / +0.66% | 15.20 | 15.30 | 15.00 | 15.20 | 15.18 | 9.46 | 58,640 |   |  
            | 4/6/2018 | +0.20 / +1.34% | 15.10 | 15.30 | 15.00 | 15.10 | 15.14 | 9.40 | 48,070 |   |  			
            | 4/5/2018 | -0.30 / -1.97% | 15.00 | 15.40 | 14.90 | 14.90 | 15.13 | 9.27 | 68,750 |   |  
            | 4/4/2018 | +0.20 / +1.33% | 15.20 | 15.60 | 15.20 | 15.20 | 15.30 | 9.46 | 43,910 |   |  			
            | 4/3/2018 | -0.30 / -1.96% | 15.20 | 15.40 | 14.90 | 15.00 | 15.09 | 9.33 | 63,220 |   |  
            | 4/2/2018 | 0.00 / 0.00% | 15.30 | 15.50 | 15.30 | 15.30 | 15.36 | 9.52 | 45,840 |   |  			
            | 3/30/2018 | -0.10 / -0.65% | 15.40 | 15.40 | 15.00 | 15.30 | 15.29 | 9.52 | 59,600 |   |  
            | 3/29/2018 | +0.10 / +0.65% | 15.40 | 15.40 | 15.20 | 15.40 | 15.33 | 9.58 | 45,280 |   |  			
            | 3/28/2018 | 0.00 / 0.00% | 15.40 | 15.50 | 15.20 | 15.30 | 15.39 | 9.52 | 51,980 |   |  
            | 3/27/2018 | 0.00 / 0.00% | 15.30 | 15.50 | 15.00 | 15.30 | 15.37 | 9.52 | 51,010 |   |  			
            | 3/26/2018 | +0.30 / +2.00% | 15.00 | 15.40 | 15.00 | 15.30 | 15.22 | 9.52 | 42,720 |   |  
            | 3/23/2018 | -0.50 / -3.23% | 15.40 | 15.40 | 14.80 | 15.00 | 15.10 | 9.33 | 54,820 |   |  			
            | 3/22/2018 | +0.10 / +0.65% | 15.40 | 15.60 | 15.40 | 15.50 | 15.47 | 9.64 | 36,140 |   |  
            | 3/21/2018 | +0.20 / +1.32% | 15.20 | 15.60 | 15.20 | 15.40 | 15.38 | 9.58 | 46,110 |   |  			
            | 3/20/2018 | -0.50 / -3.18% | 15.70 | 15.90 | 15.10 | 15.20 | 15.43 | 9.46 | 49,710 |   |  
            | 3/19/2018 | -0.30 / -1.88% | 16.10 | 16.20 | 15.70 | 15.70 | 15.93 | 9.77 | 58,740 |   |  			
            | 3/16/2018 | +0.30 / +1.91% | 15.80 | 16.20 | 15.80 | 16.00 | 16.02 | 9.96 | 51,570 |   |  
            | 3/15/2018 | 0.00 / 0.00% | 15.80 | 16.10 | 15.60 | 15.70 | 15.78 | 9.77 | 54,740 |   |  			
            | 3/14/2018 | -0.30 / -1.88% | 16.20 | 16.40 | 15.70 | 15.70 | 16.10 | 9.77 | 59,200 |   |  
            | 3/13/2018 | -0.60 / -3.61% | 16.60 | 16.70 | 15.90 | 16.00 | 16.23 | 9.96 | 57,410 |   |  			
            | 3/12/2018 | -0.30 / -1.78% | 16.90 | 17.10 | 16.50 | 16.60 | 16.76 | 10.33 | 56,980 |   |  
            | 3/9/2018 | -0.10 / -0.59% | 17.10 | 17.10 | 16.80 | 16.90 | 16.91 | 10.52 | 62,340 |   |  			
            | 3/8/2018 | +0.20 / +1.19% | 16.80 | 17.20 | 16.70 | 17.00 | 16.99 | 10.58 | 52,080 |   |  
            | 3/7/2018 | 0.00 / 0.00% | 16.90 | 17.10 | 16.60 | 16.80 | 16.87 | 10.45 | 51,460 |   |  			
            | 3/6/2018 | +0.40 / +2.44% | 16.50 | 16.90 | 16.40 | 16.80 | 16.65 | 10.45 | 57,480 |   |  
            | 3/5/2018 | 0.00 / 0.00% | 16.50 | 16.60 | 16.30 | 16.40 | 16.46 | 10.20 | 49,090 |   |  |