year   open
1975   616.24
1976   852.41
1977  1004.65
1978   831.17
1979   805.17
1980   838.74
1981   963.98
1982   875.00
1983  1046.55
1984  1256.64
1985  1211.57
1986  1546.67
1987  1895.95
1988  1938.83
1989  2168.57
1990  2753.20
1991  2633.66
1992  3168.83
1993  3301.11
1994  3754.09
1995  3834.44
1996  5177.12
1997  6448.27
1998  7908.25
1999  9181.43
2000 11497.12
2001 10786.85
2002 10021.50
2003  8341.63
2004 10783.01
2005 10783.01
2006 10717.50
2007 12463.15
2008 13264.82
2009  8776.39
2010 10428.05
2011 11577.51
2012 12217.56