| Year | Value | | 2021 | 1,150.691582 | | 2020 | 978.76063 | | 2019 | 1,344.955151 | | 2018 | 1,418.004731 | | 2017 | 1,437.245062 | | 2016 | 1,083.244836 | | 2015 | 945.2649666 | | 2014 | 989.179882 | | 2013 | 892.930674 | | 2012 | 795.11615 | | 2011 | 760.26837 | | 2010 | 784.96985 | | 2009 | 400 | | 2008 | 1,279.021 | | 2007 | 1,549.939 | | 2006 | 1,377.204 | | 2005 | 1,365.128 | | 2004 | 1,393.038 | | 2003 | 1,373.956 | | 2002 | 1,393.803 | | 2001 | 1,521.024 | | 2000 | 1,748.406 | | 1999 | 1,614.5999755859 | | 1998 | 1,475.9000244141 | | 1997 | 1,443.3000488281 | | 1996 | 1,459.0999755859 | | 1995 | 1,469.5999755859 | | 1994 | 1,368.5 | | 1993 | 1,334.9000244141 | | 1992 | 1,270.4000244141 | | 1991 | 1,227.6999511719 | | 1990 | 1,171.3000488281 | | 1989 | 1,118.6999511719 | | 1988 | 1,029.1999511719 | | 1987 | 911.5999755859 | | 1986 | 844.0999755859 | | 1985 | 756.5999755859 | | 1984 | 689.4000244141 | | 1983 | 614.4000244141 | | 1982 | 566 | | 1981 | 475.700012207 | | 1980 | 522.9000244141 | | 1979 | 483.1000061035 | | 1978 | 490.1000061035 | | 1977 | 503.8999938965 | | 1976 | 443.8999938965 | | 1975 | 396.6000061035 | | 1974 | 437.6000061035 | | 1973 | 406.3999938965 | | 1972 | 282.200012207 | | 1971 | 302.200012207 | | 1970 | 275.200012207 |
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