| 
                 
                    Closing price on 12/8/2017
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    22.70 | 
                 
                
                    | High | 
                    23.00 | 
                 
                
                    | Low | 
                    22.50 | 
                     
                
                    | Volume | 
                    61,470 | 
                                 
                
                    | Split-adjusted Price | 
                    14.12 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NAF Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                12/8/2017
             | 
            
                0.00 / 0.00%
             |             
            
                22.70
             |           
            
                23.00
             |               
            
                22.50
             |                           
            
                22.70
             | 
            
                22.76
             |                     
            
                14.12
             |                                 
            
                61,470
             |            
            
                 
             |                                       
         
    
        
            | 
                12/7/2017
             | 
            
                -0.20 / -0.87%
             |             
            
                23.00
             |           
            
                23.00
             |               
            
                22.60
             |                           
            
                22.70
             | 
            
                22.73
             |                     
            
                14.12
             |                                 
            
                51,070
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/6/2017
             | 
            
                -0.20 / -0.87%
             |             
            
                23.20
             |           
            
                23.20
             |               
            
                22.70
             |                           
            
                22.90
             | 
            
                22.89
             |                     
            
                14.25
             |                                 
            
                54,210
             |            
            
                 
             |                                       
         
    
        
            | 
                12/5/2017
             | 
            
                -0.10 / -0.43%
             |             
            
                23.30
             |           
            
                23.50
             |               
            
                23.00
             |                           
            
                23.10
             | 
            
                23.18
             |                     
            
                14.37
             |                                 
            
                59,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/4/2017
             | 
            
                +0.40 / +1.75%
             |             
            
                22.80
             |           
            
                23.40
             |               
            
                22.80
             |                           
            
                23.20
             | 
            
                23.13
             |                     
            
                14.44
             |                                 
            
                56,930
             |            
            
                 
             |                                       
         
    
        
            | 
                12/1/2017
             | 
            
                0.00 / 0.00%
             |             
            
                22.80
             |           
            
                23.00
             |               
            
                22.60
             |                           
            
                22.80
             | 
            
                22.82
             |                     
            
                14.19
             |                                 
            
                52,640
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/30/2017
             | 
            
                +0.80 / +3.64%
             |             
            
                22.00
             |           
            
                23.00
             |               
            
                22.00
             |                           
            
                22.80
             | 
            
                22.69
             |                     
            
                14.19
             |                                 
            
                68,330
             |            
            
                 
             |                                       
         
    
        
            | 
                11/29/2017
             | 
            
                +0.30 / +1.38%
             |             
            
                21.70
             |           
            
                22.00
             |               
            
                21.70
             |                           
            
                22.00
             | 
            
                21.90
             |                     
            
                13.69
             |                                 
            
                51,750
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/28/2017
             | 
            
                -0.10 / -0.46%
             |             
            
                21.90
             |           
            
                22.00
             |               
            
                21.60
             |                           
            
                21.70
             | 
            
                21.78
             |                     
            
                13.50
             |                                 
            
                52,450
             |            
            
                 
             |                                       
         
    
        
            | 
                11/27/2017
             | 
            
                +0.10 / +0.46%
             |             
            
                21.80
             |           
            
                22.00
             |               
            
                21.50
             |                           
            
                21.80
             | 
            
                21.82
             |                     
            
                13.56
             |                                 
            
                37,250
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/24/2017
             | 
            
                +0.10 / +0.46%
             |             
            
                21.70
             |           
            
                21.70
             |               
            
                21.30
             |                           
            
                21.70
             | 
            
                21.53
             |                     
            
                13.50
             |                                 
            
                51,000
             |            
            
                 
             |                                       
         
    
        
            | 
                11/23/2017
             | 
            
                0.00 / 0.00%
             |             
            
                21.60
             |           
            
                21.80
             |               
            
                21.50
             |                           
            
                21.60
             | 
            
                21.64
             |                     
            
                13.44
             |                                 
            
                47,790
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/22/2017
             | 
            
                +0.40 / +1.89%
             |             
            
                21.20
             |           
            
                21.70
             |               
            
                21.20
             |                           
            
                21.60
             | 
            
                21.44
             |                     
            
                13.44
             |                                 
            
                54,480
             |            
            
                 
             |                                       
         
    
        
            | 
                11/21/2017
             | 
            
                -0.10 / -0.47%
             |             
            
                21.30
             |           
            
                21.50
             |               
            
                21.10
             |                           
            
                21.20
             | 
            
                21.23
             |                     
            
                13.19
             |                                 
            
                49,220
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/20/2017
             | 
            
                +0.10 / +0.47%
             |             
            
                21.30
             |           
            
                21.50
             |               
            
                21.10
             |                           
            
                21.30
             | 
            
                21.28
             |                     
            
                13.25
             |                                 
            
                44,730
             |            
            
                 
             |                                       
         
    
        
            | 
                11/17/2017
             | 
            
                -1.30 / -5.78%
             |             
            
                22.50
             |           
            
                22.60
             |               
            
                20.95
             |                           
            
                21.20
             | 
            
                21.54
             |                     
            
                13.19
             |                                 
            
                70,830
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/16/2017
             | 
            
                -0.20 / -0.88%
             |             
            
                22.70
             |           
            
                22.70
             |               
            
                21.90
             |                           
            
                22.50
             | 
            
                22.43
             |                     
            
                14.00
             |                                 
            
                61,380
             |            
            
                 
             |                                       
         
    
        
            | 
                11/15/2017
             | 
            
                -0.15 / -0.66%
             |             
            
                22.90
             |           
            
                22.90
             |               
            
                22.60
             |                           
            
                22.70
             | 
            
                22.70
             |                     
            
                14.12
             |                                 
            
                49,830
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/14/2017
             | 
            
                +0.05 / +0.22%
             |             
            
                23.00
             |           
            
                23.00
             |               
            
                22.50
             |                           
            
                22.85
             | 
            
                22.80
             |                     
            
                14.22
             |                                 
            
                56,670
             |            
            
                 
             |                                       
         
    
        
            | 
                11/13/2017
             | 
            
                -0.40 / -1.72%
             |             
            
                23.10
             |           
            
                23.20
             |               
            
                22.50
             |                           
            
                22.80
             | 
            
                22.90
             |                     
            
                14.19
             |                                 
            
                49,950
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/10/2017
             | 
            
                -0.80 / -3.33%
             |             
            
                24.00
             |           
            
                24.00
             |               
            
                23.20
             |                           
            
                23.20
             | 
            
                23.55
             |                     
            
                14.44
             |                                 
            
                353,810
             |            
            
                 
             |                                       
         
    
        
            | 
                11/9/2017
             | 
            
                -0.10 / -0.41%
             |             
            
                24.00
             |           
            
                24.40
             |               
            
                24.00
             |                           
            
                24.00
             | 
            
                24.15
             |                     
            
                14.93
             |                                 
            
                352,130
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/8/2017
             | 
            
                +0.20 / +0.84%
             |             
            
                23.90
             |           
            
                24.30
             |               
            
                23.80
             |                           
            
                24.10
             | 
            
                24.04
             |                     
            
                15.00
             |                                 
            
                355,500
             |            
            
                 
             |                                       
         
    
        
            | 
                11/7/2017
             | 
            
                -0.10 / -0.42%
             |             
            
                24.20
             |           
            
                24.20
             |               
            
                23.60
             |                           
            
                23.90
             | 
            
                23.82
             |                     
            
                14.87
             |                                 
            
                354,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/6/2017
             | 
            
                -0.50 / -2.04%
             |             
            
                24.50
             |           
            
                24.70
             |               
            
                24.00
             |                           
            
                24.00
             | 
            
                24.39
             |                     
            
                14.93
             |                                 
            
                367,270
             |            
            
                 
             |                                       
         
    
        
            | 
                11/3/2017
             | 
            
                -0.05 / -0.20%
             |             
            
                24.60
             |           
            
                24.60
             |               
            
                24.40
             |                           
            
                24.50
             | 
            
                24.51
             |                     
            
                15.24
             |                                 
            
                711,030
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/2/2017
             | 
            
                -0.45 / -1.80%
             |             
            
                25.00
             |           
            
                25.00
             |               
            
                24.55
             |                           
            
                24.55
             | 
            
                24.66
             |                     
            
                15.28
             |                                 
            
                64,790
             |            
            
                 
             |                                       
         
    
        
            | 
                11/1/2017
             | 
            
                +0.30 / +1.21%
             |             
            
                24.80
             |           
            
                25.00
             |               
            
                24.50
             |                           
            
                25.00
             | 
            
                24.76
             |                     
            
                15.56
             |                                 
            
                60,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/31/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                24.60
             |           
            
                24.80
             |               
            
                24.40
             |                           
            
                24.70
             | 
            
                24.60
             |                     
            
                15.37
             |                                 
            
                71,670
             |            
            
                 
             |                                       
         
    
        
            | 
                10/30/2017
             | 
            
                -0.30 / -1.20%
             |             
            
                25.10
             |           
            
                25.20
             |               
            
                24.70
             |                           
            
                24.80
             | 
            
                24.92
             |                     
            
                15.43
             |                                 
            
                67,660
             |  
            
                 
             |                                                              
             
    
         
    
    
 |