| 
                 
                    Closing price on 2/27/2017
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    30.45 | 
                 
                
                    | High | 
                    30.50 | 
                 
                
                    | Low | 
                    30.10 | 
                     
                
                    | Volume | 
                    113,680 | 
                                 
                
                    | Split-adjusted Price | 
                    18.98 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NAF Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                2/27/2017
             | 
            
                +0.10 / +0.33%
             |             
            
                30.45
             |           
            
                30.50
             |               
            
                30.10
             |                           
            
                30.50
             | 
            
                30.37
             |                     
            
                18.98
             |                                 
            
                113,680
             |            
            
                 
             |                                       
         
    
        
            | 
                2/24/2017
             | 
            
                -0.20 / -0.65%
             |             
            
                30.60
             |           
            
                30.70
             |               
            
                30.30
             |                           
            
                30.40
             | 
            
                30.51
             |                     
            
                18.92
             |                                 
            
                110,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/23/2017
             | 
            
                0.00 / 0.00%
             |             
            
                30.60
             |           
            
                30.75
             |               
            
                30.35
             |                           
            
                30.60
             | 
            
                30.57
             |                     
            
                19.04
             |                                 
            
                105,770
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2017
             | 
            
                -0.20 / -0.65%
             |             
            
                30.80
             |           
            
                30.90
             |               
            
                30.60
             |                           
            
                30.60
             | 
            
                30.74
             |                     
            
                19.04
             |                                 
            
                123,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/21/2017
             | 
            
                +0.05 / +0.16%
             |             
            
                30.75
             |           
            
                31.00
             |               
            
                30.70
             |                           
            
                30.80
             | 
            
                30.83
             |                     
            
                19.16
             |                                 
            
                99,950
             |            
            
                 
             |                                       
         
    
        
            | 
                2/20/2017
             | 
            
                +0.05 / +0.16%
             |             
            
                30.70
             |           
            
                30.75
             |               
            
                30.50
             |                           
            
                30.75
             | 
            
                30.68
             |                     
            
                19.13
             |                                 
            
                114,940
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/17/2017
             | 
            
                -0.20 / -0.65%
             |             
            
                30.80
             |           
            
                30.90
             |               
            
                30.65
             |                           
            
                30.70
             | 
            
                30.77
             |                     
            
                19.10
             |                                 
            
                107,720
             |            
            
                 
             |                                       
         
    
        
            | 
                2/16/2017
             | 
            
                -0.20 / -0.64%
             |             
            
                31.10
             |           
            
                31.20
             |               
            
                30.90
             |                           
            
                30.90
             | 
            
                31.10
             |                     
            
                19.23
             |                                 
            
                101,060
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/15/2017
             | 
            
                -0.10 / -0.32%
             |             
            
                31.20
             |           
            
                31.20
             |               
            
                31.00
             |                           
            
                31.10
             | 
            
                31.09
             |                     
            
                19.35
             |                                 
            
                100,430
             |            
            
                 
             |                                       
         
    
        
            | 
                2/14/2017
             | 
            
                -0.10 / -0.32%
             |             
            
                31.10
             |           
            
                31.30
             |               
            
                31.00
             |                           
            
                31.20
             | 
            
                31.16
             |                     
            
                19.41
             |                                 
            
                105,890
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/13/2017
             | 
            
                +0.10 / +0.32%
             |             
            
                31.10
             |           
            
                31.40
             |               
            
                31.10
             |                           
            
                31.30
             | 
            
                31.27
             |                     
            
                19.48
             |                                 
            
                109,560
             |            
            
                 
             |                                       
         
    
        
            | 
                2/10/2017
             | 
            
                +0.10 / +0.32%
             |             
            
                31.10
             |           
            
                31.40
             |               
            
                31.00
             |                           
            
                31.20
             | 
            
                31.23
             |                     
            
                19.41
             |                                 
            
                119,410
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/9/2017
             | 
            
                0.00 / 0.00%
             |             
            
                31.10
             |           
            
                31.30
             |               
            
                30.90
             |                           
            
                31.10
             | 
            
                31.09
             |                     
            
                19.35
             |                                 
            
                104,200
             |            
            
                 
             |                                       
         
    
        
            | 
                2/8/2017
             | 
            
                -0.05 / -0.16%
             |             
            
                31.10
             |           
            
                31.20
             |               
            
                31.00
             |                           
            
                31.10
             | 
            
                31.12
             |                     
            
                19.35
             |                                 
            
                103,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/7/2017
             | 
            
                +0.05 / +0.16%
             |             
            
                31.10
             |           
            
                31.40
             |               
            
                31.10
             |                           
            
                31.15
             | 
            
                31.23
             |                     
            
                19.38
             |                                 
            
                96,980
             |            
            
                 
             |                                       
         
    
        
            | 
                2/6/2017
             | 
            
                +0.40 / +1.30%
             |             
            
                30.70
             |           
            
                31.20
             |               
            
                30.70
             |                           
            
                31.10
             | 
            
                30.99
             |                     
            
                19.35
             |                                 
            
                133,960
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/3/2017
             | 
            
                0.00 / 0.00%
             |             
            
                30.70
             |           
            
                31.00
             |               
            
                30.60
             |                           
            
                30.70
             | 
            
                30.80
             |                     
            
                19.10
             |                                 
            
                103,160
             |            
            
                 
             |                                       
         
    
        
            | 
                2/2/2017
             | 
            
                +0.10 / +0.33%
             |             
            
                30.60
             |           
            
                30.80
             |               
            
                30.50
             |                           
            
                30.70
             | 
            
                30.67
             |                     
            
                19.10
             |                                 
            
                105,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/25/2017
             | 
            
                0.00 / 0.00%
             |             
            
                30.70
             |           
            
                30.70
             |               
            
                30.30
             |                           
            
                30.60
             | 
            
                30.51
             |                     
            
                19.04
             |                                 
            
                102,870
             |            
            
                 
             |                                       
         
    
        
            | 
                1/24/2017
             | 
            
                -0.10 / -0.33%
             |             
            
                30.70
             |           
            
                30.80
             |               
            
                30.45
             |                           
            
                30.60
             | 
            
                30.62
             |                     
            
                19.04
             |                                 
            
                105,770
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/23/2017
             | 
            
                -0.20 / -0.65%
             |             
            
                30.90
             |           
            
                31.00
             |               
            
                30.60
             |                           
            
                30.70
             | 
            
                30.80
             |                     
            
                19.10
             |                                 
            
                96,670
             |            
            
                 
             |                                       
         
    
        
            | 
                1/20/2017
             | 
            
                +0.10 / +0.32%
             |             
            
                30.70
             |           
            
                31.00
             |               
            
                30.70
             |                           
            
                30.90
             | 
            
                30.84
             |                     
            
                19.23
             |                                 
            
                100,750
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/19/2017
             | 
            
                -0.30 / -0.96%
             |             
            
                31.10
             |           
            
                31.10
             |               
            
                30.70
             |                           
            
                30.80
             | 
            
                30.87
             |                     
            
                19.16
             |                                 
            
                103,280
             |            
            
                 
             |                                       
         
    
        
            | 
                1/18/2017
             | 
            
                -0.20 / -0.64%
             |             
            
                31.30
             |           
            
                31.30
             |               
            
                31.00
             |                           
            
                31.10
             | 
            
                31.14
             |                     
            
                19.35
             |                                 
            
                106,720
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/17/2017
             | 
            
                +0.10 / +0.32%
             |             
            
                31.20
             |           
            
                31.60
             |               
            
                31.20
             |                           
            
                31.30
             | 
            
                31.37
             |                     
            
                19.48
             |                                 
            
                110,880
             |            
            
                 
             |                                       
         
    
        
            | 
                1/16/2017
             | 
            
                -0.20 / -0.64%
             |             
            
                31.40
             |           
            
                31.40
             |               
            
                31.05
             |                           
            
                31.20
             | 
            
                31.19
             |                     
            
                19.41
             |                                 
            
                115,920
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/13/2017
             | 
            
                -0.10 / -0.32%
             |             
            
                31.50
             |           
            
                31.55
             |               
            
                31.30
             |                           
            
                31.40
             | 
            
                31.42
             |                     
            
                19.54
             |                                 
            
                105,160
             |            
            
                 
             |                                       
         
    
        
            | 
                1/12/2017
             | 
            
                -0.20 / -0.63%
             |             
            
                31.70
             |           
            
                31.70
             |               
            
                31.40
             |                           
            
                31.50
             | 
            
                31.53
             |                     
            
                19.60
             |                                 
            
                109,450
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/11/2017
             | 
            
                +0.20 / +0.63%
             |             
            
                31.60
             |           
            
                31.80
             |               
            
                31.40
             |                           
            
                31.70
             | 
            
                31.62
             |                     
            
                19.72
             |                                 
            
                111,270
             |            
            
                 
             |                                       
         
    
        
            | 
                1/10/2017
             | 
            
                -0.10 / -0.32%
             |             
            
                31.60
             |           
            
                31.60
             |               
            
                31.30
             |                           
            
                31.50
             | 
            
                31.45
             |                     
            
                19.60
             |                                 
            
                114,040
             |  
            
                 
             |                                                              
             
    
         
    
    
 |