| Year | Value | | 2021 | 5,717.1203964291 | | 2020 | 4,658.2480203801 | | 2019 | 5,449.0486862395 | | 2018 | 5,740.3637825646 | | 2017 | 5,505.7760364232 | | 2016 | 4,681.6779582522 | | 2015 | 5,127.6037757149 | | 2014 | 5,646.9612182872 | | 2013 | 5,977.1372383006 | | 2012 | 6,591.8459462407 | | 2011 | 7,006.2614144826 | | 2010 | 6,522.002250377 | | 2009 | 5,259.4918887103 | | 2008 | 4,818.7954118049 | | 2007 | 5,390.8204980416 | | 2006 | 5,096.6926078871 | | 2005 | 4,929.0381012781 | | 2004 | 4,396.5593623778 | | 2003 | 3,414.5364429183 | | 2002 | 2,226.4713166078 | | 2001 | 2,328.956999018 | | 2000 | 2,675.9134839258 | | 1999 | 2,712.7433883252 | | 1998 | 2,772.4693608913 | | 1997 | 3,101.6488031264 | | 1996 | 3,018.4019311991 | | 1995 | 3,234.5965304537 | | 1994 | 2,914.0177016497 | | 1993 | 2,832.2055304698 | | 1992 | 2,847.7582007747 | | 1991 | 2,626.5480804935 | | 1990 | 2,456.5119995027 | | 1989 | 2,154.5859384823 | | 1988 | 2,130.7730601562 | | 1987 | 2,023.1791201408 | | 1986 | 1,544.7493718469 | | 1985 | 1,397.9416315659 | | 1984 | 2,009.733313294 | | 1983 | 2,266.9874010346 | | 1982 | 2,071.0391587243 | | 1981 | 2,329.9736738882 | | 1980 | 2,270.4254987154 | | 1979 | 1,685.980572364 | | 1978 | 1,447.9038435868 | | 1977 | 1,307.7382686928 | | 1976 | 1,234.2143513961 | | 1975 | 1,352.847667086 | | 1974 | 1,377.5892078015 | | 1973 | 1,152.844220567 | | 1972 | 868.62759557178 | | 1971 | 860.43465532016 |
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