| 
    
        
            | 
                    Closing price on 8/28/2018
                 |  |  
    
        |           
                
                    | Open | 60.50 |  
                    | High | 61.40 |  
                    | Low | 60.50 |  
                    | Volume | 64,000 |  
                    | Split-adjusted Price | 32.57 |  
                
             | 
 |  PTB Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 8/28/2018 | +0.50 / +0.83% | 60.50 | 61.40 | 60.50 | 61.00 | 60.97 | 32.57 | 64,000 |   |  
            | 8/27/2018 | -0.40 / -0.66% | 60.20 | 61.50 | 60.10 | 60.50 | 60.60 | 32.31 | 22,820 |   |  			
            | 8/24/2018 | +1.00 / +1.67% | 60.20 | 61.30 | 59.00 | 60.90 | 60.34 | 32.52 | 121,670 |   |  
            | 8/23/2018 | -0.10 / -0.17% | 58.70 | 61.00 | 58.70 | 59.90 | 60.57 | 31.99 | 78,920 |   |  			
            | 8/22/2018 | +2.20 / +3.81% | 57.80 | 61.00 | 57.80 | 60.00 | 59.40 | 32.04 | 101,020 |   |  
            | 8/21/2018 | +0.30 / +0.52% | 57.50 | 57.90 | 57.50 | 57.80 | 57.60 | 30.87 | 30,210 |   |  			
            | 8/20/2018 | 0.00 / 0.00% | 57.30 | 58.40 | 57.30 | 57.50 | 57.57 | 30.71 | 58,140 |   |  
            | 8/17/2018 | -0.50 / -0.86% | 57.50 | 58.10 | 57.10 | 57.50 | 57.44 | 30.71 | 57,960 |   |  			
            | 8/16/2018 | +1.00 / +1.75% | 57.00 | 58.40 | 57.00 | 58.00 | 57.50 | 30.97 | 70,380 |   |  
            | 8/15/2018 | -0.50 / -0.87% | 57.50 | 58.30 | 57.00 | 57.00 | 57.09 | 30.44 | 53,830 |   |  			
            | 8/14/2018 | +0.70 / +1.23% | 56.50 | 57.50 | 55.80 | 57.50 | 56.56 | 30.71 | 71,070 |   |  
            | 8/13/2018 | -0.70 / -1.22% | 57.50 | 57.50 | 56.00 | 56.80 | 56.70 | 30.33 | 50,350 |   |  			
            | 8/10/2018 | -1.50 / -2.54% | 59.00 | 59.00 | 56.60 | 57.50 | 57.25 | 30.71 | 56,730 |   |  
            | 8/9/2018 | +1.50 / +2.61% | 58.00 | 61.00 | 58.00 | 59.00 | 59.31 | 31.51 | 49,470 |   |  			
            | 8/8/2018 | +1.20 / +2.13% | 56.00 | 57.90 | 55.70 | 57.50 | 57.18 | 30.71 | 77,550 |   |  
            | 8/7/2018 | +0.80 / +1.44% | 55.50 | 56.60 | 54.00 | 56.30 | 55.44 | 30.06 | 127,710 |   |  			
            | 8/6/2018 | -1.80 / -3.14% | 56.00 | 57.40 | 55.50 | 55.50 | 56.17 | 29.64 | 46,470 |   |  
            | 8/3/2018 | -1.70 / -2.88% | 59.00 | 59.00 | 57.00 | 57.30 | 57.66 | 30.60 | 35,970 |   |  			
            | 8/2/2018 | 0.00 / 0.00% | 58.60 | 60.00 | 58.60 | 59.00 | 58.96 | 31.51 | 20,100 |   |  
            | 8/1/2018 | -1.60 / -2.64% | 60.60 | 62.00 | 58.80 | 59.00 | 59.87 | 31.51 | 26,390 |   |  			
            | 7/31/2018 | -1.40 / -2.26% | 63.00 | 63.00 | 58.60 | 60.60 | 61.00 | 32.36 | 33,490 |   |  
            | 7/30/2018 | +0.20 / +0.32% | 62.50 | 62.50 | 61.60 | 62.00 | 61.81 | 33.11 | 32,600 |   |  			
            | 7/27/2018 | -0.30 / -0.48% | 61.50 | 62.60 | 61.50 | 61.80 | 61.91 | 33.00 | 28,120 |   |  
            | 7/26/2018 | -0.70 / -1.11% | 61.10 | 63.00 | 61.10 | 62.10 | 62.19 | 33.16 | 29,170 |   |  			
            | 7/25/2018 | +0.10 / +0.16% | 62.70 | 63.40 | 62.70 | 62.80 | 62.87 | 33.54 | 62,260 |   |  
            | 7/24/2018 | -0.60 / -0.95% | 63.00 | 63.10 | 61.00 | 62.70 | 62.18 | 33.48 | 30,990 |   |  			
            | 7/23/2018 | -0.70 / -1.09% | 65.00 | 65.50 | 63.20 | 63.30 | 63.58 | 33.80 | 84,030 |   |  
            | 7/20/2018 | -2.70 / -4.05% | 62.20 | 66.00 | 62.20 | 64.00 | 63.64 | 34.18 | 163,670 |   |  			
            | 7/19/2018 | +3.40 / +5.37% | 67.70 | 67.70 | 66.00 | 66.70 | 66.96 | 35.62 | 102,290 |   |  
            | 7/18/2018 | +3.90 / +6.57% | 61.90 | 63.30 | 60.00 | 63.30 | 62.73 | 33.80 | 38,370 |   |  |