| 
                 
                    Closing price on 3/8/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    19.00 | 
                 
                
                    | High | 
                    19.40 | 
                 
                
                    | Low | 
                    17.80 | 
                     
                
                    | Volume | 
                    1,001,150 | 
                                 
                
                    | Split-adjusted Price | 
                    15.51 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NBB Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/8/2019
             | 
            
                -0.30 / -1.58%
             |             
            
                19.00
             |           
            
                19.40
             |               
            
                17.80
             |                           
            
                18.70
             | 
            
                19.05
             |                     
            
                15.51
             |                                 
            
                1,001,150
             |            
            
                 
             |                                       
         
    
        
            | 
                3/7/2019
             | 
            
                +0.30 / +1.60%
             |             
            
                18.95
             |           
            
                19.85
             |               
            
                18.95
             |                           
            
                19.00
             | 
            
                19.26
             |                     
            
                15.76
             |                                 
            
                1,700,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/6/2019
             | 
            
                +1.20 / +6.86%
             |             
            
                17.60
             |           
            
                18.70
             |               
            
                17.60
             |                           
            
                18.70
             | 
            
                18.21
             |                     
            
                15.51
             |                                 
            
                1,188,230
             |            
            
                 
             |                                       
         
    
        
            | 
                3/5/2019
             | 
            
                -0.40 / -2.23%
             |             
            
                17.90
             |           
            
                17.90
             |               
            
                17.50
             |                           
            
                17.50
             | 
            
                17.52
             |                     
            
                14.52
             |                                 
            
                1,715,960
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/4/2019
             | 
            
                +0.40 / +2.29%
             |             
            
                17.50
             |           
            
                18.00
             |               
            
                17.00
             |                           
            
                17.90
             | 
            
                17.32
             |                     
            
                14.85
             |                                 
            
                681,380
             |            
            
                 
             |                                       
         
    
        
            | 
                3/1/2019
             | 
            
                -0.50 / -2.78%
             |             
            
                18.10
             |           
            
                18.10
             |               
            
                17.00
             |                           
            
                17.50
             | 
            
                17.08
             |                     
            
                14.52
             |                                 
            
                2,925,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/28/2019
             | 
            
                +0.10 / +0.56%
             |             
            
                18.00
             |           
            
                18.10
             |               
            
                18.00
             |                           
            
                18.00
             | 
            
                18.03
             |                     
            
                14.93
             |                                 
            
                156,580
             |            
            
                 
             |                                       
         
    
        
            | 
                2/27/2019
             | 
            
                -0.55 / -2.98%
             |             
            
                18.00
             |           
            
                18.00
             |               
            
                17.90
             |                           
            
                17.90
             | 
            
                17.95
             |                     
            
                14.85
             |                                 
            
                350,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/26/2019
             | 
            
                0.00 / 0.00%
             |             
            
                18.15
             |           
            
                18.45
             |               
            
                17.85
             |                           
            
                18.45
             | 
            
                18.12
             |                     
            
                15.31
             |                                 
            
                1,024,500
             |            
            
                 
             |                                       
         
    
        
            | 
                2/25/2019
             | 
            
                -0.55 / -2.89%
             |             
            
                18.00
             |           
            
                18.50
             |               
            
                18.00
             |                           
            
                18.45
             | 
            
                18.02
             |                     
            
                15.31
             |                                 
            
                225,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/22/2019
             | 
            
                +0.10 / +0.53%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.00
             |                     
            
                15.76
             |                                 
            
                7,000
             |            
            
                 
             |                                       
         
    
        
            | 
                2/21/2019
             | 
            
                +0.80 / +4.42%
             |             
            
                18.20
             |           
            
                18.90
             |               
            
                18.20
             |                           
            
                18.90
             | 
            
                18.75
             |                     
            
                15.68
             |                                 
            
                2,080
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/20/2019
             | 
            
                -0.90 / -4.74%
             |             
            
                18.80
             |           
            
                19.00
             |               
            
                18.10
             |                           
            
                18.10
             | 
            
                18.54
             |                     
            
                15.02
             |                                 
            
                13,810
             |            
            
                 
             |                                       
         
    
        
            | 
                2/19/2019
             | 
            
                0.00 / 0.00%
             |             
            
                18.90
             |           
            
                19.00
             |               
            
                18.50
             |                           
            
                19.00
             | 
            
                18.90
             |                     
            
                15.76
             |                                 
            
                151,210
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/18/2019
             | 
            
                +0.55 / +2.98%
             |             
            
                19.00
             |           
            
                19.00
             |               
            
                18.45
             |                           
            
                19.00
             | 
            
                18.95
             |                     
            
                15.76
             |                                 
            
                123,470
             |            
            
                 
             |                                       
         
    
        
            | 
                2/15/2019
             | 
            
                0.00 / 0.00%
             |             
            
                18.10
             |           
            
                18.45
             |               
            
                18.00
             |                           
            
                18.45
             | 
            
                18.27
             |                     
            
                15.31
             |                                 
            
                84,010
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/14/2019
             | 
            
                -0.05 / -0.27%
             |             
            
                18.50
             |           
            
                18.50
             |               
            
                18.00
             |                           
            
                18.45
             | 
            
                18.30
             |                     
            
                15.31
             |                                 
            
                130,820
             |            
            
                 
             |                                       
         
    
        
            | 
                2/13/2019
             | 
            
                -0.30 / -1.60%
             |             
            
                19.35
             |           
            
                19.35
             |               
            
                18.50
             |                           
            
                18.50
             | 
            
                18.89
             |                     
            
                15.35
             |                                 
            
                132,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/12/2019
             | 
            
                -0.20 / -1.05%
             |             
            
                19.00
             |           
            
                19.95
             |               
            
                18.80
             |                           
            
                18.80
             | 
            
                18.94
             |                     
            
                15.60
             |                                 
            
                41,550
             |            
            
                 
             |                                       
         
    
        
            | 
                2/11/2019
             | 
            
                -1.20 / -5.94%
             |             
            
                20.20
             |           
            
                20.20
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.16
             |                     
            
                15.76
             |                                 
            
                33,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/1/2019
             | 
            
                -0.40 / -1.94%
             |             
            
                20.45
             |           
            
                20.45
             |               
            
                19.40
             |                           
            
                20.20
             | 
            
                19.52
             |                     
            
                16.76
             |                                 
            
                42,770
             |            
            
                 
             |                                       
         
    
        
            | 
                1/31/2019
             | 
            
                +1.25 / +6.46%
             |             
            
                20.40
             |           
            
                20.60
             |               
            
                19.90
             |                           
            
                20.60
             | 
            
                20.51
             |                     
            
                17.09
             |                                 
            
                5,510
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/30/2019
             | 
            
                -1.20 / -5.84%
             |             
            
                20.65
             |           
            
                20.65
             |               
            
                19.35
             |                           
            
                19.35
             | 
            
                19.53
             |                     
            
                16.05
             |                                 
            
                69,500
             |            
            
                 
             |                                       
         
    
        
            | 
                1/29/2019
             | 
            
                +0.15 / +0.74%
             |             
            
                20.75
             |           
            
                20.75
             |               
            
                19.00
             |                           
            
                20.55
             | 
            
                19.84
             |                     
            
                17.05
             |                                 
            
                42,490
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/28/2019
             | 
            
                -0.10 / -0.49%
             |             
            
                19.80
             |           
            
                20.40
             |               
            
                19.80
             |                           
            
                20.40
             | 
            
                20.11
             |                     
            
                16.92
             |                                 
            
                52,010
             |            
            
                 
             |                                       
         
    
        
            | 
                1/25/2019
             | 
            
                -0.35 / -1.68%
             |             
            
                21.40
             |           
            
                21.40
             |               
            
                20.00
             |                           
            
                20.50
             | 
            
                20.24
             |                     
            
                17.01
             |                                 
            
                4,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/24/2019
             | 
            
                +0.55 / +2.71%
             |             
            
                21.40
             |           
            
                21.40
             |               
            
                20.20
             |                           
            
                20.85
             | 
            
                20.71
             |                     
            
                17.30
             |                                 
            
                11,010
             |            
            
                 
             |                                       
         
    
        
            | 
                1/23/2019
             | 
            
                +1.30 / +6.84%
             |             
            
                20.30
             |           
            
                20.30
             |               
            
                20.00
             |                           
            
                20.30
             | 
            
                20.14
             |                     
            
                16.84
             |                                 
            
                31,830
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/22/2019
             | 
            
                -1.20 / -5.94%
             |             
            
                20.60
             |           
            
                20.60
             |               
            
                19.00
             |                           
            
                19.00
             | 
            
                19.80
             |                     
            
                15.76
             |                                 
            
                3,380
             |            
            
                 
             |                                       
         
    
        
            | 
                1/21/2019
             | 
            
                -0.30 / -1.46%
             |             
            
                20.50
             |           
            
                21.00
             |               
            
                20.20
             |                           
            
                20.20
             | 
            
                20.50
             |                     
            
                16.76
             |                                 
            
                76,500
             |  
            
                 
             |                                                              
             
    
         
    
    
 |