| 
                 
                    Closing price on 5/9/2016
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    29.70 | 
                 
                
                    | High | 
                    29.90 | 
                 
                
                    | Low | 
                    29.50 | 
                     
                
                    | Volume | 
                    156,150 | 
                                 
                
                    | Split-adjusted Price | 
                    18.03 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NAF Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                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
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/25/2016
             | 
            
                +0.10 / +0.35%
             |             
            
                28.50
             |           
            
                28.60
             |               
            
                28.40
             |                           
            
                28.60
             | 
            
                28.52
             |                     
            
                17.48
             |                                 
            
                168,640
             |            
            
                 
             |                                       
         
    
        
            | 
                3/24/2016
             | 
            
                0.00 / 0.00%
             |             
            
                28.50
             |           
            
                28.60
             |               
            
                28.30
             |                           
            
                28.50
             | 
            
                28.51
             |                     
            
                17.42
             |                                 
            
                187,820
             |  
            
                 
             |                                                              
             
    
         
    
    
 |