| 
                 
                    Closing price on 7/14/2017
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    24.90 | 
                 
                
                    | High | 
                    25.60 | 
                 
                
                    | Low | 
                    24.90 | 
                     
                
                    | Volume | 
                    98,200 | 
                                 
                
                    | Split-adjusted Price | 
                    15.80 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NAF Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                7/14/2017
             | 
            
                +0.50 / +2.01%
             |             
            
                24.90
             |           
            
                25.60
             |               
            
                24.90
             |                           
            
                25.40
             | 
            
                25.30
             |                     
            
                15.80
             |                                 
            
                98,200
             |            
            
                 
             |                                       
         
    
        
            | 
                7/13/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                25.00
             |           
            
                25.00
             |               
            
                24.80
             |                           
            
                24.90
             | 
            
                24.90
             |                     
            
                15.49
             |                                 
            
                60,320
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/12/2017
             | 
            
                +0.30 / +1.21%
             |             
            
                24.70
             |           
            
                25.10
             |               
            
                24.50
             |                           
            
                25.00
             | 
            
                24.83
             |                     
            
                15.56
             |                                 
            
                74,190
             |            
            
                 
             |                                       
         
    
        
            | 
                7/11/2017
             | 
            
                +0.20 / +0.82%
             |             
            
                24.70
             |           
            
                24.80
             |               
            
                24.30
             |                           
            
                24.70
             | 
            
                24.62
             |                     
            
                15.37
             |                                 
            
                61,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/10/2017
             | 
            
                -0.10 / -0.41%
             |             
            
                24.60
             |           
            
                24.70
             |               
            
                24.40
             |                           
            
                24.50
             | 
            
                24.57
             |                     
            
                15.24
             |                                 
            
                64,600
             |            
            
                 
             |                                       
         
    
        
            | 
                7/7/2017
             | 
            
                -0.05 / -0.20%
             |             
            
                24.70
             |           
            
                24.80
             |               
            
                24.60
             |                           
            
                24.60
             | 
            
                24.69
             |                     
            
                15.31
             |                                 
            
                61,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/6/2017
             | 
            
                +0.05 / +0.20%
             |             
            
                24.60
             |           
            
                24.90
             |               
            
                24.50
             |                           
            
                24.65
             | 
            
                24.70
             |                     
            
                15.34
             |                                 
            
                71,050
             |            
            
                 
             |                                       
         
    
        
            | 
                7/5/2017
             | 
            
                +0.10 / +0.41%
             |             
            
                24.50
             |           
            
                24.80
             |               
            
                24.50
             |                           
            
                24.60
             | 
            
                24.66
             |                     
            
                15.31
             |                                 
            
                75,110
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/4/2017
             | 
            
                -0.20 / -0.81%
             |             
            
                24.70
             |           
            
                24.70
             |               
            
                24.40
             |                           
            
                24.50
             | 
            
                24.51
             |                     
            
                15.24
             |                                 
            
                64,090
             |            
            
                 
             |                                       
         
    
        
            | 
                7/3/2017
             | 
            
                +0.10 / +0.41%
             |             
            
                24.60
             |           
            
                24.80
             |               
            
                24.50
             |                           
            
                24.70
             | 
            
                24.65
             |                     
            
                15.37
             |                                 
            
                71,510
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/30/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                24.70
             |           
            
                24.90
             |               
            
                24.60
             |                           
            
                24.60
             | 
            
                24.73
             |                     
            
                15.31
             |                                 
            
                66,600
             |            
            
                 
             |                                       
         
    
        
            | 
                6/29/2017
             | 
            
                +0.10 / +0.41%
             |             
            
                24.60
             |           
            
                24.90
             |               
            
                24.60
             |                           
            
                24.70
             | 
            
                24.73
             |                     
            
                15.37
             |                                 
            
                66,120
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/28/2017
             | 
            
                +0.10 / +0.41%
             |             
            
                24.50
             |           
            
                24.70
             |               
            
                24.30
             |                           
            
                24.60
             | 
            
                24.52
             |                     
            
                15.31
             |                                 
            
                67,010
             |            
            
                 
             |                                       
         
    
        
            | 
                6/27/2017
             | 
            
                -0.20 / -0.81%
             |             
            
                24.70
             |           
            
                24.80
             |               
            
                24.40
             |                           
            
                24.50
             | 
            
                24.59
             |                     
            
                15.24
             |                                 
            
                71,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/26/2017
             | 
            
                +0.30 / +1.23%
             |             
            
                24.40
             |           
            
                24.90
             |               
            
                24.40
             |                           
            
                24.70
             | 
            
                24.72
             |                     
            
                15.37
             |                                 
            
                65,300
             |            
            
                 
             |                                       
         
    
        
            | 
                6/23/2017
             | 
            
                -0.20 / -0.81%
             |             
            
                24.60
             |           
            
                24.70
             |               
            
                24.40
             |                           
            
                24.40
             | 
            
                24.57
             |                     
            
                15.18
             |                                 
            
                58,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/22/2017
             | 
            
                +0.10 / +0.41%
             |             
            
                24.50
             |           
            
                24.90
             |               
            
                24.50
             |                           
            
                24.60
             | 
            
                24.70
             |                     
            
                15.31
             |                                 
            
                65,150
             |            
            
                 
             |                                       
         
    
        
            | 
                6/21/2017
             | 
            
                -0.60 / -2.39%
             |             
            
                25.00
             |           
            
                25.00
             |               
            
                24.00
             |                           
            
                24.50
             | 
            
                24.55
             |                     
            
                15.24
             |                                 
            
                82,920
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/20/2017
             | 
            
                0.00 / 0.00%
             |             
            
                25.10
             |           
            
                25.40
             |               
            
                25.10
             |                           
            
                25.10
             | 
            
                25.19
             |                     
            
                15.62
             |                                 
            
                64,670
             |            
            
                 
             |                                       
         
    
        
            | 
                6/19/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                25.00
             |           
            
                25.30
             |               
            
                25.00
             |                           
            
                25.10
             | 
            
                25.11
             |                     
            
                15.62
             |                                 
            
                68,190
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/16/2017
             | 
            
                +0.10 / +0.40%
             |             
            
                24.90
             |           
            
                25.20
             |               
            
                24.80
             |                           
            
                25.00
             | 
            
                25.02
             |                     
            
                15.56
             |                                 
            
                67,430
             |            
            
                 
             |                                       
         
    
        
            | 
                6/15/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                25.00
             |           
            
                25.10
             |               
            
                24.70
             |                           
            
                24.90
             | 
            
                24.92
             |                     
            
                15.49
             |                                 
            
                58,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/14/2017
             | 
            
                +0.40 / +1.63%
             |             
            
                24.60
             |           
            
                25.10
             |               
            
                24.60
             |                           
            
                25.00
             | 
            
                24.87
             |                     
            
                15.56
             |                                 
            
                77,720
             |            
            
                 
             |                                       
         
    
        
            | 
                6/13/2017
             | 
            
                -1.10 / -4.28%
             |             
            
                25.70
             |           
            
                25.70
             |               
            
                23.95
             |                           
            
                24.60
             | 
            
                24.95
             |                     
            
                15.31
             |                                 
            
                101,380
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/12/2017
             | 
            
                +0.10 / +0.39%
             |             
            
                25.60
             |           
            
                25.80
             |               
            
                25.60
             |                           
            
                25.70
             | 
            
                25.71
             |                     
            
                15.99
             |                                 
            
                67,980
             |            
            
                 
             |                                       
         
    
        
            | 
                6/9/2017
             | 
            
                0.00 / 0.00%
             |             
            
                25.60
             |           
            
                25.80
             |               
            
                25.60
             |                           
            
                25.60
             | 
            
                25.70
             |                     
            
                15.93
             |                                 
            
                69,890
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/8/2017
             | 
            
                -0.30 / -1.16%
             |             
            
                25.80
             |           
            
                25.80
             |               
            
                25.40
             |                           
            
                25.60
             | 
            
                25.60
             |                     
            
                15.93
             |                                 
            
                67,000
             |            
            
                 
             |                                       
         
    
        
            | 
                6/7/2017
             | 
            
                +0.20 / +0.78%
             |             
            
                25.60
             |           
            
                26.10
             |               
            
                25.60
             |                           
            
                25.90
             | 
            
                25.86
             |                     
            
                16.12
             |                                 
            
                70,190
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/6/2017
             | 
            
                +0.10 / +0.39%
             |             
            
                25.60
             |           
            
                25.80
             |               
            
                25.40
             |                           
            
                25.70
             | 
            
                25.67
             |                     
            
                15.99
             |                                 
            
                64,700
             |            
            
                 
             |                                       
         
    
        
            | 
                6/5/2017
             | 
            
                +0.30 / +1.19%
             |             
            
                25.20
             |           
            
                25.70
             |               
            
                25.20
             |                           
            
                25.60
             | 
            
                25.50
             |                     
            
                15.93
             |                                 
            
                69,340
             |  
            
                 
             |                                                              
             
    
         
    
    
 |