| Year | Value | | 2021 | 4,290.02284466 | | 2020 | 3,694.732316836 | | 2019 | 4,908.614207 | | 2018 | 5,041.5024985839 | | 2017 | 4,732.5277210279 | | 2016 | 4,095.448901315 | | 2015 | 4,244.9336909706 | | 2014 | 4,258.0318062971 | | 2013 | 4,340.0843352962 | | 2012 | 3,562.2831352485 | | 2011 | 3,559.736840242 | | 2010 | 3,641.1140738593 | | 2009 | 5,391.634 | | 2008 | 3,869.441 | | 2007 | 3,444.494 | | 2006 | 3,275.897 | | 2005 | 3,420.508 | | 2004 | 3,514.202 | | 2003 | 2,859.146 | | 2002 | 2,765.028 | | 2001 | 2,813.73 | | 2000 | 3,238.65 | | 1999 | 2,950.4000506402 | | 1998 | 3,367.0000413954 | | 1997 | 3,393.5000209809 | | 1996 | 2,585.6000719071 | | 1995 | 2,707.5000123978 | | 1994 | 2,730.599981308 | | 1993 | 2,468.200049162 | | 1992 | 2,298.8000360129 | | 1991 | 2,115.5999533533 | | 1990 | 2,191.0000176428 | | 1989 | 2,089.6000123024 | | 1988 | 1,970.2999763488 | | 1987 | 2,085.2999979256 | | 1986 | 2,032.8000309467 | | 1985 | 1,883.4000328779 | | 1984 | 1,784.5000314714 | | 1983 | 1,480.3999741075 | | 1982 | 1,543.1000208855 | | 1981 | 1,396.7000225781 | | 1980 | 1,269.7999957798 | | 1979 | 1,221.7000085116 | | 1978 | 1,208.0999774932 | | 1977 | 1,054.5999861958 | | 1976 | 918.9000133276 | | 1975 | 832.0999953748 | | 1974 | 798.6000047922 | | 1973 | 652.8000146151 | | 1972 | 548.0000023842 | | 1971 | 435.2999982239 | | 1970 | 404.500005245 |
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