| 
                 
                    Closing price on 2/1/2018
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    19.00 | 
                 
                
                    | High | 
                    19.10 | 
                 
                
                    | Low | 
                    18.70 | 
                     
                
                    | Volume | 
                    54,310 | 
                                 
                
                    | Split-adjusted Price | 
                    11.70 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NAF Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                2/1/2018
             | 
            
                -0.10 / -0.53%
             |             
            
                19.00
             |           
            
                19.10
             |               
            
                18.70
             |                           
            
                18.80
             | 
            
                18.85
             |                     
            
                11.70
             |                                 
            
                54,310
             |            
            
                 
             |                                       
         
    
        
            | 
                1/31/2018
             | 
            
                -0.70 / -3.57%
             |             
            
                19.60
             |           
            
                19.70
             |               
            
                18.90
             |                           
            
                18.90
             | 
            
                19.08
             |                     
            
                11.76
             |                                 
            
                56,920
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/30/2018
             | 
            
                0.00 / 0.00%
             |             
            
                19.60
             |           
            
                19.70
             |               
            
                19.40
             |                           
            
                19.60
             | 
            
                19.55
             |                     
            
                12.20
             |                                 
            
                55,510
             |            
            
                 
             |                                       
         
    
        
            | 
                1/29/2018
             | 
            
                -0.30 / -1.51%
             |             
            
                19.90
             |           
            
                19.90
             |               
            
                19.50
             |                           
            
                19.60
             | 
            
                19.78
             |                     
            
                12.20
             |                                 
            
                54,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/26/2018
             | 
            
                0.00 / 0.00%
             |             
            
                19.80
             |           
            
                20.10
             |               
            
                19.80
             |                           
            
                19.90
             | 
            
                19.91
             |                     
            
                12.38
             |                                 
            
                55,110
             |            
            
                 
             |                                       
         
    
        
            | 
                1/25/2018
             | 
            
                -0.05 / -0.25%
             |             
            
                20.00
             |           
            
                20.10
             |               
            
                19.80
             |                           
            
                19.90
             | 
            
                19.93
             |                     
            
                12.38
             |                                 
            
                61,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/22/2018
             | 
            
                +0.15 / +0.76%
             |             
            
                19.90
             |           
            
                20.20
             |               
            
                19.90
             |                           
            
                19.95
             | 
            
                20.02
             |                     
            
                12.41
             |                                 
            
                1,502,450
             |            
            
                 
             |                                       
         
    
        
            | 
                1/19/2018
             | 
            
                -0.20 / -1.00%
             |             
            
                20.10
             |           
            
                20.20
             |               
            
                19.80
             |                           
            
                19.80
             | 
            
                19.98
             |                     
            
                12.32
             |                                 
            
                1,487,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/18/2018
             | 
            
                -0.40 / -1.96%
             |             
            
                20.40
             |           
            
                20.40
             |               
            
                19.80
             |                           
            
                20.00
             | 
            
                20.04
             |                     
            
                12.44
             |                                 
            
                1,473,800
             |            
            
                 
             |                                       
         
    
        
            | 
                1/17/2018
             | 
            
                -0.50 / -2.39%
             |             
            
                21.00
             |           
            
                21.00
             |               
            
                20.40
             |                           
            
                20.40
             | 
            
                20.55
             |                     
            
                12.69
             |                                 
            
                1,532,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/16/2018
             | 
            
                -0.10 / -0.48%
             |             
            
                20.90
             |           
            
                21.00
             |               
            
                20.60
             |                           
            
                20.90
             | 
            
                20.85
             |                     
            
                13.00
             |                                 
            
                1,483,990
             |            
            
                 
             |                                       
         
    
        
            | 
                1/15/2018
             | 
            
                +0.40 / +1.94%
             |             
            
                20.60
             |           
            
                21.10
             |               
            
                20.30
             |                           
            
                21.00
             | 
            
                20.77
             |                     
            
                13.07
             |                                 
            
                68,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/12/2018
             | 
            
                -0.10 / -0.48%
             |             
            
                20.70
             |           
            
                20.90
             |               
            
                20.60
             |                           
            
                20.60
             | 
            
                20.72
             |                     
            
                12.82
             |                                 
            
                59,460
             |            
            
                 
             |                                       
         
    
        
            | 
                1/11/2018
             | 
            
                +0.20 / +0.98%
             |             
            
                20.50
             |           
            
                20.80
             |               
            
                20.40
             |                           
            
                20.70
             | 
            
                20.58
             |                     
            
                12.88
             |                                 
            
                59,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/10/2018
             | 
            
                +0.10 / +0.49%
             |             
            
                20.50
             |           
            
                20.80
             |               
            
                20.30
             |                           
            
                20.50
             | 
            
                20.56
             |                     
            
                12.76
             |                                 
            
                51,990
             |            
            
                 
             |                                       
         
    
        
            | 
                1/9/2018
             | 
            
                0.00 / 0.00%
             |             
            
                20.60
             |           
            
                20.60
             |               
            
                20.20
             |                           
            
                20.40
             | 
            
                20.42
             |                     
            
                12.69
             |                                 
            
                51,530
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/8/2018
             | 
            
                +0.10 / +0.49%
             |             
            
                20.40
             |           
            
                20.60
             |               
            
                20.30
             |                           
            
                20.40
             | 
            
                20.45
             |                     
            
                12.69
             |                                 
            
                78,190
             |            
            
                 
             |                                       
         
    
        
            | 
                1/5/2018
             | 
            
                +0.50 / +2.53%
             |             
            
                19.90
             |           
            
                20.30
             |               
            
                19.80
             |                           
            
                20.30
             | 
            
                20.10
             |                     
            
                12.63
             |                                 
            
                40,390
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/4/2018
             | 
            
                -1.30 / -6.16%
             |             
            
                21.00
             |           
            
                21.00
             |               
            
                19.70
             |                           
            
                19.80
             | 
            
                20.14
             |                     
            
                12.32
             |                                 
            
                1,486,550
             |            
            
                 
             |                                       
         
    
        
            | 
                1/3/2018
             | 
            
                0.00 / 0.00%
             |             
            
                21.20
             |           
            
                21.30
             |               
            
                21.00
             |                           
            
                21.10
             | 
            
                21.14
             |                     
            
                13.13
             |                                 
            
                1,481,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/2/2018
             | 
            
                -0.20 / -0.94%
             |             
            
                21.30
             |           
            
                21.40
             |               
            
                20.90
             |                           
            
                21.10
             | 
            
                21.19
             |                     
            
                13.13
             |                                 
            
                1,483,890
             |            
            
                 
             |                                       
         
    
        
            | 
                12/29/2017
             | 
            
                -0.20 / -0.93%
             |             
            
                21.50
             |           
            
                21.50
             |               
            
                21.20
             |                           
            
                21.30
             | 
            
                21.38
             |                     
            
                13.25
             |                                 
            
                1,479,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/28/2017
             | 
            
                +1.30 / +6.44%
             |             
            
                19.30
             |           
            
                21.50
             |               
            
                19.10
             |                           
            
                21.50
             | 
            
                20.33
             |                     
            
                13.38
             |                                 
            
                384,920
             |            
            
                 
             |                                       
         
    
        
            | 
                12/27/2017
             | 
            
                +1.30 / +6.88%
             |             
            
                20.20
             |           
            
                20.20
             |               
            
                20.20
             |                           
            
                20.20
             | 
            
                20.20
             |                     
            
                12.57
             |                                 
            
                380,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/26/2017
             | 
            
                -0.90 / -4.55%
             |             
            
                19.50
             |           
            
                19.60
             |               
            
                18.70
             |                           
            
                18.90
             | 
            
                18.99
             |                     
            
                11.76
             |                                 
            
                414,220
             |            
            
                 
             |                                       
         
    
        
            | 
                12/25/2017
             | 
            
                -0.90 / -4.35%
             |             
            
                19.40
             |           
            
                20.50
             |               
            
                19.40
             |                           
            
                19.80
             | 
            
                19.83
             |                     
            
                12.32
             |                                 
            
                52,940
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/22/2017
             | 
            
                -0.20 / -0.96%
             |             
            
                21.00
             |           
            
                21.30
             |               
            
                20.70
             |                           
            
                20.70
             | 
            
                20.92
             |                     
            
                12.88
             |                                 
            
                39,820
             |            
            
                 
             |                                       
         
    
        
            | 
                12/21/2017
             | 
            
                -0.30 / -1.42%
             |             
            
                21.30
             |           
            
                21.50
             |               
            
                20.80
             |                           
            
                20.90
             | 
            
                21.16
             |                     
            
                13.00
             |                                 
            
                41,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/20/2017
             | 
            
                +0.10 / +0.47%
             |             
            
                21.50
             |           
            
                21.60
             |               
            
                21.00
             |                           
            
                21.20
             | 
            
                21.31
             |                     
            
                13.19
             |                                 
            
                49,600
             |            
            
                 
             |                                       
         
    
        
            | 
                12/19/2017
             | 
            
                -0.20 / -0.94%
             |             
            
                21.30
             |           
            
                21.40
             |               
            
                20.50
             |                           
            
                21.10
             | 
            
                20.96
             |                     
            
                13.13
             |                                 
            
                50,670
             |  
            
                 
             |                                                              
             
    
         
    
    
 |