Year | Value | 2021 | 21,967.345239874 | 2020 | 19,496.168365537 | 2019 | 20,365.479080758 | 2018 | 20,770.88605072 | 2017 | 19,506.467752586 | 2016 | 18,458.819304715 | 2015 | 18,583.075273481 | 2014 | 21,654.011684384 | 2013 | 21,430.682664391 | 2012 | 20,604.695619341 | 2011 | 21,511.287914159 | 2010 | 19,521.813833629 | 2009 | 19,029.605395117 | 2008 | 21,712.672370513 | 2007 | 20,103.89455618 | 2006 | 17,331.290714724 | 2005 | 16,098.440727902 | 2004 | 15,169.488730604 | 2003 | 13,012.341016637 | 2002 | 10,720.340274318 | 2001 | 9,845.7215816688 | 2000 | 9,805.9882631398 | 1999 | 10,452.524589753 | 1998 | 10,562.571895883 | 1997 | 10,205.868778501 | 1996 | 10,727.651412296 | 1995 | 10,475.719447408 | 1994 | 9,137.9398908289 | 1993 | 8,700.1357104382 | 1992 | 9,567.9313499414 | 1991 | 8,818.3961796654 | 1990 | 8,564.3912583664 | 1989 | 6,959.8286067235 | 1988 | 6,863.4314073517 | 1987 | 6,190.0879474143 | 1986 | 5,042.8752343607 | 1985 | 3,686.7714860218 | 1984 | 3,582.0817386627 | 1983 | 3,746.8083199308 | 1982 | 3,884.780143173 | 1981 | 4,080.937055247 | 1980 | 4,670.2149989908 | 1979 | 4,182.028193927 | 1978 | 3,457.6876549928 | 1977 | 2,848.3311430809 | 1976 | 2,544.2519806095 | 1975 | 2,468.7514500398 | 1974 | 2,136.1915802767 | 1973 | 1,924.5172707839 | 1972 | 1,530.2912726981 | 1971 | 1,290.818266289 | 1970 | 1,157.2792363752 |
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