| Year | Value | | 2021 | 7,510.0116700827 | | 2020 | 6,475.2110682069 | | 2019 | 6,806.4727875236 | | 2018 | 6,741.3657205005 | | 2017 | 6,439.6911520485 | | 2016 | 5,852.0242463181 | | 2015 | 5,911.3072084302 | | 2014 | 6,318.3901143187 | | 2013 | 6,173.0788399599 | | 2012 | 5,843.3905750542 | | 2011 | 5,466.0558703733 | | 2010 | 4,670.5526338314 | | 2009 | 3,899.4758165625 | | 2008 | 4,012.7826191987 | | 2007 | 3,388.2460842932 | | 2006 | 2,747.3808315749 | | 2005 | 2,316.6608938656 | | 2004 | 1,969.6326805748 | | 2003 | 1,676.6993279488 | | 2002 | 1,511.65355201 | | 2001 | 1,498.0442893892 | | 2000 | 1,510.8068925058 | | 1999 | 1,384.8694431543 | | 1998 | 1,468.9358356207 | | 1997 | 1,544.5871414156 | | 1996 | 1,463.7664341507 | | 1995 | 1,333.0545118558 | | 1994 | 1,196.0603840583 | | 1993 | 1,076.9495439232 | | 1992 | 975.79134661125 | | 1991 | 896.53670121455 | | 1990 | 835.66492903855 | | 1989 | 705.17049806469 | | 1988 | 642.37534430004 | | 1987 | 578.69375360649 | | 1986 | 562.7924314403 | | 1985 | 557.300815848 | | 1984 | 555.97179588317 | | 1983 | 540.85331637928 | | 1982 | 584.71783511176 | | 1981 | 619.47385523181 | | 1980 | 564.44718944787 | | 1979 | 503.47172306957 | | 1978 | 443.69936938364 | | 1977 | 422.9554781561 | | 1976 | 388.23089624796 | | 1975 | 374.87335277286 | | 1974 | 350.22540285534 | | 1973 | 292.5248686064 | | 1972 | 231.23144005329 | | 1971 | 209.63539429673 | | 1970 | 196.37277727475 |
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