| Year | Value | | 2021 | 5,402.522176287 | | 2020 | 5,454.1011835428 | | 2019 | 5,947.1098492332 | | 2018 | 5,478.5617389348 | | 2017 | 4,990.9374734353 | | 2016 | 4,522.75636691 | | 2015 | 4,364.6180277758 | | 2014 | 4,430.694930801 | | 2013 | 4,562.54917969 | | 2012 | 4,450.7732340091 | | 2011 | 4,316.3465890356 | | 2010 | 3,957.8159396002 | | 2009 | 3,306.3718668551 | | 2008 | 3,412.4861408143 | | 2007 | 3,170.4734492144 | | 2006 | 2,663.8505037346 | | 2005 | 2,261.2962459834 | | 2004 | 2,093.2428213248 | | 2003 | 1,849.7084244716 | | 2002 | 1,639.3209269546 | | 2001 | 1,458.4818642159 | | 2000 | 1,573.7534208413 | | 1999 | 1,592.6985015167 | | 1998 | 1,410.3145948675 | | 1997 | 1,980.7065095874 | | 1996 | 2,537.9839440467 | | 1995 | 2,418.1381435315 | | 1994 | 2,140.0207588137 | | 1993 | 1,917.883751793 | | 1992 | 1,684.6564504235 | | 1991 | 1,510.6150045714 | | 1990 | 1,332.5984765498 | | 1989 | 1,169.6191499602 | | 1988 | 1,011.3589262032 | | 1987 | 839.72017211443 | | 1986 | 725.22753224177 | | 1985 | 670.76110076809 | | 1984 | 744.58458027953 | | 1983 | 736.66436639107 | | 1982 | 683.5417054011 | | 1981 | 666.80191382945 | | 1980 | 639.28414970972 | | 1979 | 560.46692531082 | | 1978 | 505.59295446038 | | 1977 | 427.06341876751 | | 1976 | 375.144670544 | | 1975 | 337.89674455651 | | 1974 | 320.36653347326 | | 1973 | 258.02522383551 | | 1972 | 197.91161277075 | | 1971 | 184.28142449871 |
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