| Year | Value | | 2021 | 1,230.786090909 | | 2020 | 842.992 | | 2019 | 1,640.735 | | 2018 | 1,841.314 | | 2017 | 1,581.35236 | | 2016 | 1,532.761243 | | 2015 | 1,409.329209 | | 2014 | 1,508.892548 | | 2013 | 1,444.374258 | | 2012 | 1,371.470116 | | 2011 | 1,354.590823 | | 2010 | 1,282.496418 | | 2009 | 1,057.893 | | 2008 | 1,181.567 | | 2007 | 1,104.843 | | 2006 | 1,039.027 | | 2005 | 1,109.641 | | 2004 | 1,089.934 | | 2003 | 1,248.302 | | 2002 | 1,028.307 | | 2001 | 1,641.819 | | 2000 | 1,971.647 | | 1999 | 1,877.3000488281 | | 1998 | 1,963.4000244141 | | 1997 | 1,829.6999511719 | | 1996 | 1,511.3000488281 | | 1995 | 1,509.5 | | 1994 | 1,408.4000244141 | | 1993 | 1,247.3000488281 | | 1992 | 1,063.5999755859 | | 1991 | 944.799987793 | | 1990 | 928.5 | | 1989 | 888.700012207 | | 1988 | 813.5 | | 1987 | 734 | | 1986 | 673.9000244141 | | 1985 | 636.799987793 | | 1984 | 633.5999755859 | | 1983 | 540 | | 1982 | 461.299987793 | | 1981 | 453.299987793 | | 1980 | 421.5 | | 1979 | 407 | | 1978 | 402.5 | | 1977 | 350.8999938965 | | 1976 | 320.8999938965 | | 1975 | 285.799987793 | | 1974 | 272.200012207 | | 1973 | 236.6000061035 | | 1972 | 198.1999969482 | | 1971 | 181.8999938965 | | 1970 | 169.1000061035 |
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