|  
                Year  
            |  
         
             Beginning Price  
            |  
         
             Ending Price  
            |  
         
             Gain or Loss 
            |  
         
             Percent Gain or Loss  
            |  
      
|  
           1984 
            |  
         
           11.125 
            |  
         
           9.625 
            |  
         
           -1.50 
            |  
         
           -13.48% 
            |  
      
|  
           1985 
            |  
         
           9.625 
            |  
         
           20.625 
            |  
         
           13.0625 
            |  
         
           135.71% 
            |  
      
|  
           1986 
            |  
         
           20.625 
            |  
         
           21.25 
            |  
         
           5.9375 
            |  
         
           28.79% 
            |  
      
|  
           1987 
            |  
         
           21.25 
            |  
         
           10.875 
            |  
         
           -10.375 
            |  
         
           -48.82% 
            |  
      
|  
           1988 
            |  
         
           10.875 
            |  
         
           11.125 
            |  
         
           0.25 
            |  
         
           2.30% 
            |  
      
|  
           1989 
            |  
         
           11.125 
            |  
         
           12.375 
            |  
         
           1.25 
            |  
         
           11.24% 
            |  
      
|  
           1990 
            |  
         
           12.375 
            |  
         
           13.00 
            |  
         
           0.625 
            |  
         
           5.05% 
            |  
      
|  
           1991 
            |  
         
           13.00 
            |  
         
           24.25 
            |  
         
           11.25 
            |  
         
           86.54% 
            |  
      
|  
           1992 
            |  
         
           24.25 
            |  
         
           26.00 
            |  
         
           1.75 
            |  
         
           7.22% 
            |  
      
|  
           1993 
            |  
         
           26.00 
            |  
         
           31.09375* 
            |  
         
           5.09375 
            |  
         
           19.59% 
            |  
      
|  
           1994 
            |  
         
           24.875 
            |  
         
           21.25 
            |  
         
           -3.625 
            |  
         
           -14.57% 
            |  
      
|  
           1995 
            |  
         
           21.25 
            |  
         
           27.50 
            |  
         
           6.25 
            |  
         
           29.41% 
            |  
      
|  
           1996 
            |  
         
           27.50 
            |  
         
           38.50 
            |  
         
           11.00 
            |  
         
           40.00% 
            |  
      
|  
           1997 
            |  
         
           38.50 
            |  
         
           74.5833* 
            |  
         
           36.0833 
            |  
         
           93.72% 
            |  
      
|  
           1998 
            |  
         
           55.9375 
            |  
         
           63.125* 
            |  
         
           7.1875 
            |  
         
           12.85% 
            |  
      
|  
           1999 
            |  
         
           31.5625 
            |  
         
           36.25 
            |  
         
           4.6875 
            |  
         
           14.85% 
            |  
      
|  
           2000 
            |  
         
           36.25 
            |  
         
           54.50 
            |  
         
           18.25 
            |  
         
           50.34% 
            |  
      
|  
           2001 
            |  
         
           54.50 
            |  
         
           49.98 
            |  
         
           -4.52 
            |  
         
           -8.29% 
            |  
      
|  
           2002 
            |  
         
           49.98 
            |  
         
           48.54 
            |  
         
           -1.44 
            |  
         
           -2.88% 
            |  
      
|  
           2003 
            |  
         
           48.54 
            |  
         
           77.18 
            |  
         
           28.64 
            |  
         
           59.00% 
            |  
      
|  
           2004 
            |  
         
           77.18 
            |  
         
           109.89* 
            |  
         
           32.71 
            |  
         
           42.38% 
            |  
      
|  
           2005 
            |  
         
           73.26 
            |  
         
           119.69 
            |  
         
           46.43 
            |  
         
           63.38% 
            |  
      
|  
           2006 
            |  
         
           119.69 
            |  
         
           95.05 
            |  
         
           -24.64 
            |  
         
           -20.59% 
            |  
      
|  
           2007 
            |  
         
           95.05 
            |  
         
           73.15 
            |  
         
           -21.90 
            |  
         
           -23.04% 
            |  
      
|  
           2008 
            |  
         
           73.15 
            |  
         
           21.91 
            |  
         
           -51.24 
            |  
         
           -70.05% 
            |  
      
|  
           2009 
            |  
         
           21.91 
            |  
         
           30.16 
            |  
         
           8.25 
            |  
         
           37.65% 
            |  
      
|  
           2010 
            |  
         
           30.16 
            |  
         
           36.27 
            |  
         
           6.11 
            |  
         
           20.26% 
            |  
      
|  
           2011 
            |  
         
           36.27 
            |  
         
           24.05 
            |  
         
           -12.22 
            |  
         
           -33.69% 
            |  
      
|  
           2012 
            |  
         
           24.05 
            |  
         
           25.72 
            |  
         
           1.67 
            |  
         
           6.94% 
            |  
      
|  
           2013 
            |  
         
           25.72 
            |  
         
           43.48 
            |  
         
           17.76 
            |  
         
           69.05% 
            |  
      
|  
           2014 
            |  
         
           43.48 
            |  
         
           53.37 
            |  
         
           9.89 
            |  
         
           22.75% 
            |  
      
|  
           2015 
            |  
        
           53.37 
            |  
         
           39.23 
            |  
         
           -14.14 
            |  
         
           -26.49% 
            |  
      
|  
           2016 
            |  
        
           39.23 
            |  
         
           29.91 
            |  
         
           -9.32 
            |  
         
           -23.76% 
            |  
      
|  
           2017 
            |  
         
           29.91 
            |  
         
           41.98 
            |  
         
           12.07 
            |  
         
           40.35% 
            |  
      
|  
           2018 
            |  
        
           41.98 
            |  
         
           25.51 
            |  
         
           -16.47 
            |  
         
           -39.23% 
            |  
      
|  
           2019 
            |  
        
           25.51 
            |  
         
           35.91 
            |  
         
           10.40 
            |  
         
           40.77% 
            |  
      
|  
           2020 
            |  
        
           35.91 
            |  
         
           50.00* 
            |  
         
           14.09 
            |  
         
           39.24% 
            |