| Year | Value | | 2021 | 10,968.731374291 | | 2020 | 10,790.542539273 | | 2019 | 11,300.935194468 | | 2018 | 11,041.918998774 | | 2017 | 10,833.44651993 | | 2016 | 10,786.888023346 | | 2015 | 10,446.759040717 | | 2014 | 9,736.6097811136 | | 2013 | 9,678.3511051998 | | 2012 | 9,109.0715213242 | | 2011 | 8,301.604889594 | | 2010 | 7,417.7775214612 | | 2009 | 6,119.0728872784 | | 2008 | 6,322.8274537716 | | 2007 | 5,543.4633945436 | | 2006 | 4,715.9182865125 | | 2005 | 4,166.283600033 | | 2004 | 3,925.1548771783 | | 2003 | 3,687.5052206741 | | 2002 | 3,595.9461670787 | | 2001 | 3,530.7490804043 | | 2000 | 3,378.3685165429 | | 1999 | 3,300.0782034673 | | 1998 | 3,315.6512223471 | | 1997 | 3,156.3637986605 | | 1996 | 2,991.5381971166 | | 1995 | 3,026.015081623 | | 1994 | 2,815.7858503911 | | 1993 | 2,594.4657787547 | | 1992 | 2,370.4414139583 | | 1991 | 2,033.3196875819 | | 1990 | 1,624.419764228 | | 1989 | 1,475.9984589763 | | 1988 | 1,335.2727750146 | | 1987 | 1,358.6085675948 | | 1986 | 1,365.6667608852 | | 1985 | 1,225.7493632058 | | 1984 | 1,158.4804852392 | | 1983 | 990.84027938876 | | 1982 | 782.8304854572 | | 1981 | 853.12531703828 | | 1980 | 1,737.3300617482 | | 1979 | 1,504.5818509475 | | 1978 | 1,359.7320059649 | | 1977 | 1,228.6284445959 | | 1976 | 980.92577051683 | | 1975 | 817.22105260135 | | 1974 | 720.22302137475 | | 1973 | 674.04501787717 | | 1972 | 553.96350026486 | | 1971 | 502.43677408652 |
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