| Year | Value | | 2021 | 850.819356 | | 2020 | 494.260587847 | | 2019 | 1,191.466578 | | 2018 | 1,118.73285 | | 2017 | 1,078.63356 | | 2016 | 1,068.160640636 | | 2015 | 1,035.487113 | | 2014 | 962.636446 | | 2013 | 957.997754181 | | 2012 | 1,131.8505200872 | | 2011 | 1,313.2931679581 | | 2010 | 1,235.8648846014 | | 2009 | 1,079.589 | | 2008 | 1,306.438 | | 2007 | 1,203.877 | | 2006 | 1,100.205 | | 2005 | 1,021.743 | | 2004 | 1,043.562 | | 2003 | 872.739 | | 2002 | 807.417 | | 2001 | 878.871 | | 2000 | 879.499 | | 1999 | 816 | | 1998 | 767.0999755859 | | 1997 | 740.200012207 | | 1996 | 739.5999755859 | | 1995 | 689.5999755859 | | 1994 | 580.9000244141 | | 1993 | 553.799987793 | | 1992 | 584.5999755859 | | 1991 | 622.799987793 | | 1990 | 759.700012207 | | 1989 | 732.5999755859 | | 1988 | 597.9000244141 | | 1987 | 526.4000244141 | | 1986 | 532.5999755859 | | 1985 | 522.299987793 | | 1984 | 483.200012207 | | 1983 | 442.8999938965 | | 1982 | 448 | | 1981 | 425.8999938965 | | 1980 | 389.700012207 | | 1979 | 376.6000061035 | | 1978 | 358.6000061035 | | 1977 | 324.200012207 | | 1976 | 264.299987793 | | 1975 | 214.6999969482 | | 1974 | 199.5 | | 1973 | 172 | | 1972 | 154.8999938965 | | 1971 | 131.6000061035 | | 1970 | 90.8000030518 |
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