| 
                 
                    Closing price on 5/30/2017
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    25.00 | 
                 
                
                    | High | 
                    25.00 | 
                 
                
                    | Low | 
                    24.90 | 
                     
                
                    | Volume | 
                    28,050 | 
                                 
                
                    | Split-adjusted Price | 
                    15.49 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NAF Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/30/2017
             | 
            
                -0.10 / -0.40%
             |             
            
                25.00
             |           
            
                25.00
             |               
            
                24.90
             |                           
            
                24.90
             | 
            
                24.96
             |                     
            
                15.49
             |                                 
            
                28,050
             |            
            
                 
             |                                       
         
    
        
            | 
                5/29/2017
             | 
            
                -1.70 / -6.37%
             |             
            
                26.70
             |           
            
                26.80
             |               
            
                24.95
             |                           
            
                25.00
             | 
            
                25.38
             |                     
            
                15.56
             |                                 
            
                171,960
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/26/2017
             | 
            
                -0.50 / -1.84%
             |             
            
                27.30
             |           
            
                27.30
             |               
            
                26.70
             |                           
            
                26.70
             | 
            
                27.02
             |                     
            
                16.61
             |                                 
            
                87,310
             |            
            
                 
             |                                       
         
    
        
            | 
                5/25/2017
             | 
            
                -1.00 / -3.55%
             |             
            
                28.20
             |           
            
                28.40
             |               
            
                27.20
             |                           
            
                27.20
             | 
            
                27.92
             |                     
            
                16.92
             |                                 
            
                97,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/24/2017
             | 
            
                +0.10 / +0.36%
             |             
            
                28.00
             |           
            
                28.30
             |               
            
                27.80
             |                           
            
                28.20
             | 
            
                28.10
             |                     
            
                17.55
             |                                 
            
                94,480
             |            
            
                 
             |                                       
         
    
        
            | 
                5/23/2017
             | 
            
                -0.40 / -1.40%
             |             
            
                28.50
             |           
            
                28.60
             |               
            
                28.00
             |                           
            
                28.10
             | 
            
                28.32
             |                     
            
                17.48
             |                                 
            
                93,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/22/2017
             | 
            
                +0.20 / +0.71%
             |             
            
                28.40
             |           
            
                28.90
             |               
            
                28.40
             |                           
            
                28.50
             | 
            
                28.63
             |                     
            
                17.73
             |                                 
            
                113,100
             |            
            
                 
             |                                       
         
    
        
            | 
                5/19/2017
             | 
            
                +0.40 / +1.43%
             |             
            
                27.90
             |           
            
                28.30
             |               
            
                27.80
             |                           
            
                28.30
             | 
            
                28.10
             |                     
            
                17.61
             |                                 
            
                111,420
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/18/2017
             | 
            
                0.00 / 0.00%
             |             
            
                28.00
             |           
            
                28.10
             |               
            
                27.80
             |                           
            
                27.90
             | 
            
                27.95
             |                     
            
                17.36
             |                                 
            
                84,570
             |            
            
                 
             |                                       
         
    
        
            | 
                5/17/2017
             | 
            
                +0.10 / +0.36%
             |             
            
                27.80
             |           
            
                28.00
             |               
            
                27.60
             |                           
            
                27.90
             | 
            
                27.83
             |                     
            
                17.36
             |                                 
            
                93,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/16/2017
             | 
            
                0.00 / 0.00%
             |             
            
                27.80
             |           
            
                28.00
             |               
            
                27.70
             |                           
            
                27.80
             | 
            
                27.86
             |                     
            
                17.30
             |                                 
            
                83,100
             |            
            
                 
             |                                       
         
    
        
            | 
                5/15/2017
             | 
            
                -0.10 / -0.36%
             |             
            
                27.70
             |           
            
                28.00
             |               
            
                27.30
             |                           
            
                27.80
             | 
            
                27.75
             |                     
            
                17.30
             |                                 
            
                81,360
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/12/2017
             | 
            
                -0.10 / -0.36%
             |             
            
                28.00
             |           
            
                28.20
             |               
            
                27.85
             |                           
            
                27.90
             | 
            
                28.01
             |                     
            
                17.36
             |                                 
            
                90,820
             |            
            
                 
             |                                       
         
    
        
            | 
                5/11/2017
             | 
            
                0.00 / 0.00%
             |             
            
                28.00
             |           
            
                28.20
             |               
            
                27.90
             |                           
            
                28.00
             | 
            
                28.07
             |                     
            
                17.42
             |                                 
            
                87,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/10/2017
             | 
            
                +0.10 / +0.36%
             |             
            
                27.80
             |           
            
                28.00
             |               
            
                27.60
             |                           
            
                28.00
             | 
            
                27.83
             |                     
            
                17.42
             |                                 
            
                102,680
             |            
            
                 
             |                                       
         
    
        
            | 
                5/9/2017
             | 
            
                0.00 / 0.00%
             |             
            
                27.80
             |           
            
                28.00
             |               
            
                27.65
             |                           
            
                27.90
             | 
            
                27.81
             |                     
            
                17.36
             |                                 
            
                91,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/8/2017
             | 
            
                -0.10 / -0.36%
             |             
            
                28.00
             |           
            
                28.10
             |               
            
                27.80
             |                           
            
                27.90
             | 
            
                27.92
             |                     
            
                17.36
             |                                 
            
                102,980
             |            
            
                 
             |                                       
         
    
        
            | 
                5/5/2017
             | 
            
                0.00 / 0.00%
             |             
            
                28.00
             |           
            
                28.20
             |               
            
                27.80
             |                           
            
                28.00
             | 
            
                28.07
             |                     
            
                17.42
             |                                 
            
                105,550
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/4/2017
             | 
            
                +0.10 / +0.36%
             |             
            
                28.00
             |           
            
                28.30
             |               
            
                27.80
             |                           
            
                28.00
             | 
            
                28.03
             |                     
            
                17.42
             |                                 
            
                91,800
             |            
            
                 
             |                                       
         
    
        
            | 
                5/3/2017
             | 
            
                +0.30 / +1.09%
             |             
            
                27.60
             |           
            
                28.00
             |               
            
                27.60
             |                           
            
                27.90
             | 
            
                27.80
             |                     
            
                17.36
             |                                 
            
                101,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/28/2017
             | 
            
                -0.10 / -0.36%
             |             
            
                27.50
             |           
            
                27.80
             |               
            
                27.30
             |                           
            
                27.60
             | 
            
                27.56
             |                     
            
                17.17
             |                                 
            
                94,950
             |            
            
                 
             |                                       
         
    
        
            | 
                4/27/2017
             | 
            
                +0.10 / +0.36%
             |             
            
                27.60
             |           
            
                27.80
             |               
            
                27.10
             |                           
            
                27.70
             | 
            
                27.61
             |                     
            
                17.24
             |                                 
            
                98,890
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/26/2017
             | 
            
                +0.60 / +2.22%
             |             
            
                27.10
             |           
            
                27.70
             |               
            
                27.00
             |                           
            
                27.60
             | 
            
                27.38
             |                     
            
                17.17
             |                                 
            
                128,220
             |            
            
                 
             |                                       
         
    
        
            | 
                4/25/2017
             | 
            
                -0.40 / -1.46%
             |             
            
                27.40
             |           
            
                27.40
             |               
            
                26.70
             |                           
            
                27.00
             | 
            
                26.97
             |                     
            
                16.80
             |                                 
            
                28,440
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/24/2017
             | 
            
                -0.45 / -1.62%
             |             
            
                26.55
             |           
            
                27.85
             |               
            
                26.55
             |                           
            
                27.40
             | 
            
                27.55
             |                     
            
                17.05
             |                                 
            
                20,470
             |            
            
                 
             |                                       
         
    
        
            | 
                4/21/2017
             | 
            
                -0.65 / -2.28%
             |             
            
                28.50
             |           
            
                28.50
             |               
            
                27.80
             |                           
            
                27.85
             | 
            
                27.95
             |                     
            
                17.33
             |                                 
            
                14,170
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/20/2017
             | 
            
                -0.40 / -1.38%
             |             
            
                28.90
             |           
            
                29.00
             |               
            
                28.50
             |                           
            
                28.50
             | 
            
                28.55
             |                     
            
                17.73
             |                                 
            
                22,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/19/2017
             | 
            
                -0.60 / -2.03%
             |             
            
                29.50
             |           
            
                29.50
             |               
            
                28.90
             |                           
            
                28.90
             | 
            
                29.03
             |                     
            
                17.98
             |                                 
            
                45,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2017
             | 
            
                -0.60 / -1.99%
             |             
            
                30.10
             |           
            
                30.10
             |               
            
                29.50
             |                           
            
                29.50
             | 
            
                29.52
             |                     
            
                18.36
             |                                 
            
                11,620
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2017
             | 
            
                -0.30 / -0.99%
             |             
            
                30.40
             |           
            
                30.50
             |               
            
                30.00
             |                           
            
                30.10
             | 
            
                30.31
             |                     
            
                18.73
             |                                 
            
                101,670
             |  
            
                 
             |                                                              
             
    
         
    
    
 |