| Year | Value | | 2021 | 20,961.2116 | | 2020 | 19,264.2436 | | 2019 | 25,394.5878 | | 2018 | 25,256.2071 | | 2017 | 23,323.6147 | | 2016 | 21,304.5851 | | 2015 | 19,805.63 | | 2014 | 17,822.581 | | 2013 | 16,053.7331 | | 2012 | 15,568.753 | | 2011 | 16,764.869 | | 2010 | 17,193.8774 | | 2009 | 11,976.438 | | 2008 | 11,386.055 | | 2007 | 11,189.538 | | 2006 | 7,692.205 | | 2005 | 7,579.401 | | 2004 | 7,024.25 | | 2003 | 5,650.63 | | 2002 | 5,013.505 | | 2001 | 4,232.312 | | 2000 | 3,900.08 | | 1999 | 3,295.3999023438 | | 1998 | 2,474.1999511719 | | 1997 | 2,083.6000976563 | | 1996 | 1,688.5999755859 | | 1995 | 1,501 | | 1994 | 1,717.1999511719 | | 1993 | 1,547 | | 1992 | 1,316 | | 1991 | 1,009.5 | | 1990 | 818.299987793 | | 1989 | 683.0999755859 | | 1988 | 731.799987793 | | 1987 | 647.5 | | 1986 | 467.5 | | 1985 | 403 | | 1984 | 302 | | 1983 | 216 | | 1982 | 184.1999969482 | | 1981 | 155.3999938965 | | 1980 | 120.9000015259 | | 1979 | 123 | | 1978 | 86 | | 1977 | 60 | | 1976 | 49 | | 1975 | 46.2000007629 | | 1974 | 29.2000007629 |
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