| Year | Value | | 2021 | 19,991.845046024 | | 2020 | 15,458.046879593 | | 2019 | 20,155.297952413 | | 2018 | 19,057.044512703 | | 2017 | 17,221.324022734 | | 2016 | 13,940.654651794 | | 2015 | 12,668.692722275 | | 2014 | 13,271.768743683 | | 2013 | 12,791.78104714 | | 2012 | 12,402.724192649 | | 2011 | 11,551.581153094 | | 2010 | 10,943.953421655 | | 2009 | 9,211.525 | | 2008 | 7,711.138 | | 2007 | 7,803.411 | | 2006 | 8,063.393 | | 2005 | 7,525.127 | | 2004 | 7,997.579 | | 2003 | 7,341.228 | | 2002 | 6,888.411 | | 2001 | 6,645.036 | | 2000 | 6,946.396 | | 1999 | 6,758.2000741659 | | 1998 | 6,515.4999828859 | | 1997 | 7,061.2000739501 | | 1996 | 6,603.3000547217 | | 1995 | 6,615.2000906543 | | 1994 | 6,385.7000209388 | | 1993 | 5,498.4999335931 | | 1992 | 5,148.7000168111 | | 1991 | 4,746.5999761445 | | 1990 | 5,118.3000122381 | | 1989 | 5,065.2000003009 | | 1988 | 4,814.3000165669 | | 1987 | 4,509.5000638217 | | 1986 | 4,062.8000486121 | | 1985 | 3,926.399986841 | | 1984 | 3,873.4999620695 | | 1983 | 3,291.0000049246 | | 1982 | 2,979.2000170722 | | 1981 | 2,892.7999932691 | | 1980 | 2,526.0999895333 | | 1979 | 2,162.300001271 | | 1978 | 2,008.3000282273 | | 1977 | 1,784.4000100495 | | 1976 | 1,478.2000133917 | | 1975 | 1,247.4000030388 | | 1974 | 1,106.5000048652 | | 1973 | 965.1999991909 | | 1972 | 772.5000058785 | | 1971 | 709.7000127513 | | 1970 | 631.6000028623 |
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