| Year | Value | | 2021 | 11,095.880284013 | | 2020 | 9,756.1614482433 | | 2019 | 11,556.470339279 | | 2018 | 12,167.308445825 | | 2017 | 11,819.49187743 | | 2016 | 11,133.063385716 | | 2015 | 11,281.8130725 | | 2014 | 11,688.278247218 | | 2013 | 12,514.969408973 | | 2012 | 11,887.515929724 | | 2011 | 10,604.980164109 | | 2010 | 9,546.4658450094 | | 2009 | 7,671.3843305576 | | 2008 | 7,731.6726222043 | | 2007 | 7,053.8773454877 | | 2006 | 6,243.9522960915 | | 2005 | 5,570.9322139274 | | 2004 | 4,580.7366991168 | | 2003 | 3,831.864108452 | | 2002 | 3,658.1269569499 | | 2001 | 3,767.4456483373 | | 2000 | 4,103.7715979396 | | 1999 | 4,067.0538656359 | | 1998 | 4,583.0631887063 | | 1997 | 4,728.6724751591 | | 1996 | 4,357.1778982296 | | 1995 | 4,097.932520471 | | 1994 | 3,221.9287792062 | | 1993 | 2,886.2876378833 | | 1992 | 2,680.842107655 | | 1991 | 2,181.0481217533 | | 1990 | 1,853.0890358049 | | 1989 | 1,637.8682909682 | | 1988 | 1,451.6336227827 | | 1987 | 1,275.8660704767 | | 1986 | 1,064.2562560302 | | 1985 | 968.88480344359 | | 1984 | 1,185.6129441297 | | 1983 | 1,272.3082831444 | | 1982 | 1,683.1781849632 | | 1981 | 2,490.8825475095 | | 1980 | 2,109.1979288195 | | 1979 | 1,593.2839148907 | | 1978 | 1,182.3360705109 | | 1977 | 1,041.5226975215 | | 1976 | 741.6890784143 | | 1975 | 541.47098765466 | | 1974 | 1,272.0009998557 | | 1973 | 1,396.619730777 | | 1972 | 1,036.6535867242 | | 1971 | 954.33339733106 | | 1970 | 788.89131885606 |
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