| Year | Value | | 2021 | 7,498.9324280361 | | 2020 | 6,577.2634335011 | | 2019 | 7,909.2331672828 | | 2018 | 7,652.4699212363 | | 2017 | 7,406.8855841598 | | 2016 | 7,000.8535655008 | | 2015 | 7,746.1474282624 | | 2014 | 8,664.8457860038 | | 2013 | 8,347.4524647013 | | 2012 | 7,974.7119061819 | | 2011 | 7,971.2147543634 | | 2010 | 7,437.9035094641 | | 2009 | 6,354.7329092363 | | 2008 | 7,917.9785476415 | | 2007 | 7,701.6778084893 | | 2006 | 7,220.3319105578 | | 2005 | 6,566.570894356 | | 2004 | 6,062.2960785663 | | 2003 | 5,763.5855735359 | | 2002 | 6,325.4915082977 | | 2001 | 6,320.7760284495 | | 2000 | 5,961.2819348282 | | 1999 | 5,168.1318835078 | | 1998 | 4,602.1115092956 | | 1997 | 4,413.1998454461 | | 1996 | 3,564.9434310464 | | 1995 | 3,157.5707390855 | | 1994 | 5,032.5133763633 | | 1993 | 4,866.3817948989 | | 1992 | 3,519.8327998794 | | 1991 | 3,081.4607753195 | | 1990 | 2,514.72331576 | | 1989 | 2,138.9814520989 | | 1988 | 1,746.5292301254 | | 1987 | 1,373.5517508089 | | 1986 | 1,273.8813398559 | | 1985 | 1,933.7869503816 | | 1984 | 1,810.9055837507 | | 1983 | 1,552.1286590695 | | 1982 | 1,991.6232377736 | | 1981 | 3,087.369630682 | | 1980 | 2,444.9015908531 | | 1979 | 1,662.8072640513 | | 1978 | 1,336.9724297632 | | 1977 | 1,104.9995797875 | | 1976 | 1,250.9707955236 | | 1975 | 1,284.6392640633 | | 1974 | 1,092.4762423457 | | 1973 | 871.75163949829 | | 1972 | 731.65508521832 | | 1971 | 656.04957482079 | | 1970 | 611.18965735679 |
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