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            | 
                    Closing price on 5/11/2016
                 |  |  
    
        |           
                
                    | Open | 29.50 |  
                    | High | 29.60 |  
                    | Low | 29.40 |  
                    | Volume | 143,690 |  
                    | Split-adjusted Price | 18.03 |  
                
             | 
 |  NAF Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/11/2016 | 0.00 / 0.00% | 29.50 | 29.60 | 29.40 | 29.50 | 29.50 | 18.03 | 143,690 |   |  
            | 5/10/2016 | 0.00 / 0.00% | 29.50 | 29.50 | 29.30 | 29.50 | 29.42 | 18.03 | 158,700 |   |  			
            | 5/9/2016 | -0.30 / -1.01% | 29.70 | 29.90 | 29.50 | 29.50 | 29.68 | 18.03 | 156,150 |   |  
            | 5/6/2016 | +0.20 / +0.68% | 29.60 | 29.90 | 29.50 | 29.80 | 29.74 | 18.21 | 161,970 |   |  			
            | 5/5/2016 | +0.10 / +0.34% | 29.50 | 29.70 | 29.50 | 29.60 | 29.62 | 18.09 | 186,020 |   |  
            | 5/4/2016 | -0.20 / -0.67% | 29.70 | 29.70 | 29.50 | 29.50 | 29.60 | 18.03 | 120,760 |   |  			
            | 4/29/2016 | 0.00 / 0.00% | 29.60 | 29.90 | 29.60 | 29.70 | 29.76 | 18.15 | 152,000 |   |  
            | 4/28/2016 | 0.00 / 0.00% | 29.60 | 29.80 | 29.60 | 29.70 | 29.67 | 18.15 | 206,460 |   |  			
            | 4/27/2016 | -0.20 / -0.67% | 29.80 | 29.90 | 29.60 | 29.70 | 29.72 | 18.15 | 153,210 |   |  
            | 4/26/2016 | +0.20 / +0.67% | 29.70 | 30.00 | 29.50 | 29.90 | 29.77 | 18.27 | 171,200 |   |  			
            | 4/25/2016 | -0.20 / -0.67% | 29.90 | 30.00 | 29.60 | 29.70 | 29.78 | 18.15 | 185,660 |   |  
            | 4/22/2016 | +0.30 / +1.01% | 29.50 | 29.90 | 29.40 | 29.90 | 29.79 | 18.27 | 202,680 |   |  			
            | 4/21/2016 | +0.30 / +1.02% | 29.20 | 29.70 | 29.20 | 29.60 | 29.47 | 18.09 | 191,410 |   |  
            | 4/20/2016 | +0.20 / +0.69% | 28.90 | 29.40 | 28.90 | 29.30 | 29.25 | 17.91 | 188,100 |   |  			
            | 4/19/2016 | -0.50 / -1.69% | 29.60 | 29.60 | 29.10 | 29.10 | 29.42 | 17.78 | 174,280 |   |  
            | 4/15/2016 | +0.10 / +0.34% | 29.50 | 29.80 | 29.50 | 29.60 | 29.63 | 18.09 | 177,410 |   |  			
            | 4/14/2016 | 0.00 / 0.00% | 29.50 | 29.80 | 29.40 | 29.50 | 29.59 | 18.03 | 207,410 |   |  
            | 4/13/2016 | 0.00 / 0.00% | 29.60 | 29.80 | 29.40 | 29.50 | 29.61 | 18.03 | 205,960 |   |  			
            | 4/12/2016 | -0.10 / -0.34% | 29.60 | 29.60 | 29.30 | 29.50 | 29.47 | 18.03 | 180,060 |   |  
            | 4/11/2016 | -0.20 / -0.67% | 29.90 | 30.00 | 29.50 | 29.60 | 29.72 | 18.09 | 222,330 |   |  			
            | 4/8/2016 | -0.30 / -1.00% | 30.10 | 30.10 | 29.70 | 29.80 | 29.88 | 18.21 | 219,140 |   |  
            | 4/7/2016 | +0.10 / +0.33% | 30.00 | 30.10 | 29.70 | 30.10 | 29.89 | 18.39 | 230,500 |   |  			
            | 4/6/2016 | +0.40 / +1.35% | 29.60 | 30.00 | 29.60 | 30.00 | 29.79 | 18.33 | 254,890 |   |  
            | 4/5/2016 | +0.60 / +2.07% | 29.10 | 29.60 | 29.00 | 29.60 | 29.31 | 18.09 | 252,540 |   |  			
            | 4/4/2016 | 0.00 / 0.00% | 28.90 | 29.20 | 28.80 | 29.00 | 29.03 | 17.72 | 188,130 |   |  
            | 4/1/2016 | -0.20 / -0.68% | 29.20 | 29.20 | 28.80 | 29.00 | 28.97 | 17.72 | 206,800 |   |  			
            | 3/31/2016 | -0.30 / -1.02% | 29.50 | 29.60 | 29.20 | 29.20 | 29.38 | 17.84 | 211,650 |   |  
            | 3/30/2016 | 0.00 / 0.00% | 29.40 | 29.70 | 29.20 | 29.50 | 29.42 | 18.03 | 225,150 |   |  			
            | 3/29/2016 | +0.50 / +1.72% | 29.10 | 29.60 | 29.00 | 29.50 | 29.35 | 18.03 | 277,910 |   |  
            | 3/28/2016 | +0.40 / +1.40% | 28.60 | 29.00 | 28.40 | 29.00 | 28.69 | 17.72 | 228,600 |   |  |