| Year | Value | | 2021 | 1,283.99841 | | 2020 | 1,458.39578 | | 2019 | 1,232.41109 | | 2018 | 1,226.44199 | | 2017 | 1,237.960141 | | 2016 | 1,441.23 | | 2015 | 1,392.236 | | 2014 | 1,553.479 | | 2013 | 1,512.319 | | 2012 | 1,527.067 | | 2011 | 1,422.29934 | | 2010 | 1,399.549392 | | 2009 | 1,179.048 | | 2008 | 1,307.721 | | 2007 | 1,294.967 | | 2006 | 1,027.669 | | 2005 | 1,053.819 | | 2004 | 1,094.133 | | 2003 | 1,130.19 | | 2002 | 1,098.015 | | 2001 | 1,277.282 | | 2000 | 1,312.011 | | 1999 | 1,139.4000244141 | | 1998 | 1,246.1999511719 | | 1997 | 1,071.1999511719 | | 1996 | 806.200012207 | | 1995 | 775.4000244141 | | 1994 | 652.5 | | 1993 | 616.200012207 | | 1992 | 529 | | 1991 | 428.8999938965 | | 1990 | 418.5 | | 1989 | 329.5 | | 1988 | 242.8000030518 | | 1987 | 186.3999938965 | | 1986 | 137.1999969482 | | 1985 | 114.1999969482 | | 1984 | 105.4000015259 | | 1983 | 120.3000030518 | | 1982 | 141.6999969482 | | 1981 | 153.3000030518 | | 1980 | 144.8999938965 | | 1979 | 85 | | 1978 | 102.0999984741 | | 1977 | 105.1999969482 | | 1976 | 75.6999969482 | | 1975 | 57.2000007629 | | 1974 | 55.2000007629 | | 1973 | 46.7000007629 | | 1972 | 52.7000007629 | | 1971 | 46.7999992371 | | 1970 | 41.0999984741 |
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