| 
                 
                    Closing price on 10/30/2017
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    25.10 | 
                 
                
                    | High | 
                    25.20 | 
                 
                
                    | Low | 
                    24.70 | 
                     
                
                    | Volume | 
                    67,660 | 
                                 
                
                    | Split-adjusted Price | 
                    15.43 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NAF Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                10/30/2017
             | 
            
                -0.30 / -1.20%
             |             
            
                25.10
             |           
            
                25.20
             |               
            
                24.70
             |                           
            
                24.80
             | 
            
                24.92
             |                     
            
                15.43
             |                                 
            
                67,660
             |            
            
                 
             |                                       
         
    
        
            | 
                10/27/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                25.10
             |           
            
                25.10
             |               
            
                24.80
             |                           
            
                25.10
             | 
            
                25.00
             |                     
            
                15.62
             |                                 
            
                68,050
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/26/2017
             | 
            
                -0.20 / -0.79%
             |             
            
                25.20
             |           
            
                25.30
             |               
            
                24.80
             |                           
            
                25.00
             | 
            
                25.05
             |                     
            
                15.56
             |                                 
            
                70,310
             |            
            
                 
             |                                       
         
    
        
            | 
                10/25/2017
             | 
            
                +0.20 / +0.80%
             |             
            
                25.10
             |           
            
                25.30
             |               
            
                25.00
             |                           
            
                25.20
             | 
            
                25.18
             |                     
            
                15.68
             |                                 
            
                53,330
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/24/2017
             | 
            
                0.00 / 0.00%
             |             
            
                24.90
             |           
            
                25.10
             |               
            
                24.70
             |                           
            
                25.00
             | 
            
                24.99
             |                     
            
                15.56
             |                                 
            
                74,790
             |            
            
                 
             |                                       
         
    
        
            | 
                10/23/2017
             | 
            
                -0.30 / -1.19%
             |             
            
                25.30
             |           
            
                25.30
             |               
            
                24.90
             |                           
            
                25.00
             | 
            
                25.03
             |                     
            
                15.56
             |                                 
            
                204,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/20/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                25.10
             |           
            
                25.50
             |               
            
                25.10
             |                           
            
                25.30
             | 
            
                25.32
             |                     
            
                15.74
             |                                 
            
                200,810
             |            
            
                 
             |                                       
         
    
        
            | 
                10/19/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                25.10
             |           
            
                25.40
             |               
            
                25.00
             |                           
            
                25.20
             | 
            
                25.24
             |                     
            
                15.68
             |                                 
            
                666,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/18/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                25.20
             |           
            
                25.50
             |               
            
                25.10
             |                           
            
                25.10
             | 
            
                25.28
             |                     
            
                15.62
             |                                 
            
                673,570
             |            
            
                 
             |                                       
         
    
        
            | 
                10/17/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                25.10
             |           
            
                25.40
             |               
            
                25.00
             |                           
            
                25.20
             | 
            
                25.17
             |                     
            
                15.68
             |                                 
            
                669,440
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/16/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                25.20
             |           
            
                25.50
             |               
            
                25.10
             |                           
            
                25.10
             | 
            
                25.28
             |                     
            
                15.62
             |                                 
            
                668,320
             |            
            
                 
             |                                       
         
    
        
            | 
                10/13/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                25.20
             |           
            
                25.50
             |               
            
                25.20
             |                           
            
                25.20
             | 
            
                25.28
             |                     
            
                15.68
             |                                 
            
                672,660
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/12/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                25.30
             |           
            
                25.50
             |               
            
                25.10
             |                           
            
                25.10
             | 
            
                25.31
             |                     
            
                15.62
             |                                 
            
                665,980
             |            
            
                 
             |                                       
         
    
        
            | 
                10/11/2017
             | 
            
                0.00 / 0.00%
             |             
            
                25.20
             |           
            
                25.50
             |               
            
                25.20
             |                           
            
                25.20
             | 
            
                25.34
             |                     
            
                15.68
             |                                 
            
                667,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/10/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                25.10
             |           
            
                25.30
             |               
            
                25.10
             |                           
            
                25.20
             | 
            
                25.20
             |                     
            
                15.68
             |                                 
            
                663,010
             |            
            
                 
             |                                       
         
    
        
            | 
                10/9/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                25.00
             |           
            
                25.20
             |               
            
                24.90
             |                           
            
                25.10
             | 
            
                25.11
             |                     
            
                15.62
             |                                 
            
                668,130
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/6/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                24.90
             |           
            
                25.20
             |               
            
                24.80
             |                           
            
                25.00
             | 
            
                25.00
             |                     
            
                15.56
             |                                 
            
                661,680
             |            
            
                 
             |                                       
         
    
        
            | 
                10/5/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                25.00
             |           
            
                25.30
             |               
            
                24.90
             |                           
            
                24.90
             | 
            
                25.07
             |                     
            
                15.49
             |                                 
            
                657,030
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/4/2017
             | 
            
                +0.20 / +0.81%
             |             
            
                24.80
             |           
            
                25.10
             |               
            
                24.60
             |                           
            
                25.00
             | 
            
                24.90
             |                     
            
                15.56
             |                                 
            
                661,210
             |            
            
                 
             |                                       
         
    
        
            | 
                10/3/2017
             | 
            
                0.00 / 0.00%
             |             
            
                24.80
             |           
            
                25.10
             |               
            
                24.70
             |                           
            
                24.80
             | 
            
                24.90
             |                     
            
                15.43
             |                                 
            
                660,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/2/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                24.90
             |           
            
                25.10
             |               
            
                24.80
             |                           
            
                24.80
             | 
            
                24.93
             |                     
            
                15.43
             |                                 
            
                653,830
             |            
            
                 
             |                                       
         
    
        
            | 
                9/29/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                25.00
             |           
            
                25.10
             |               
            
                24.80
             |                           
            
                24.90
             | 
            
                24.92
             |                     
            
                15.49
             |                                 
            
                658,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/28/2017
             | 
            
                0.00 / 0.00%
             |             
            
                25.00
             |           
            
                25.30
             |               
            
                25.00
             |                           
            
                25.00
             | 
            
                25.11
             |                     
            
                15.56
             |                                 
            
                658,860
             |            
            
                 
             |                                       
         
    
        
            | 
                9/27/2017
             | 
            
                -0.80 / -3.10%
             |             
            
                25.80
             |           
            
                25.80
             |               
            
                24.90
             |                           
            
                25.00
             | 
            
                25.24
             |                     
            
                15.56
             |                                 
            
                676,360
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/26/2017
             | 
            
                -0.30 / -1.15%
             |             
            
                26.10
             |           
            
                26.20
             |               
            
                25.70
             |                           
            
                25.80
             | 
            
                25.91
             |                     
            
                16.05
             |                                 
            
                665,060
             |            
            
                 
             |                                       
         
    
        
            | 
                9/25/2017
             | 
            
                0.00 / 0.00%
             |             
            
                26.20
             |           
            
                26.30
             |               
            
                26.00
             |                           
            
                26.10
             | 
            
                26.13
             |                     
            
                16.24
             |                                 
            
                662,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/22/2017
             | 
            
                0.00 / 0.00%
             |             
            
                26.10
             |           
            
                26.40
             |               
            
                26.00
             |                           
            
                26.10
             | 
            
                26.21
             |                     
            
                16.24
             |                                 
            
                666,990
             |            
            
                 
             |                                       
         
    
        
            | 
                9/21/2017
             | 
            
                -0.40 / -1.51%
             |             
            
                26.50
             |           
            
                26.60
             |               
            
                26.10
             |                           
            
                26.10
             | 
            
                26.35
             |                     
            
                16.24
             |                                 
            
                658,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/20/2017
             | 
            
                0.00 / 0.00%
             |             
            
                26.60
             |           
            
                26.70
             |               
            
                26.50
             |                           
            
                26.50
             | 
            
                26.59
             |                     
            
                16.49
             |                                 
            
                665,370
             |            
            
                 
             |                                       
         
    
        
            | 
                9/19/2017
             | 
            
                0.00 / 0.00%
             |             
            
                26.60
             |           
            
                26.80
             |               
            
                26.50
             |                           
            
                26.50
             | 
            
                26.64
             |                     
            
                16.49
             |                                 
            
                662,040
             |  
            
                 
             |                                                              
             
    
         
    
    
 |