Year | Value | 2021 | 4,505.835028729 | 2020 | 4,322.4726735509 | 2019 | 4,527.3561226921 | 2018 | 4,688.6904152692 | 2017 | 4,388.4348976308 | 2016 | 4,420.120801578 | 2015 | 4,605.2455005234 | 2014 | 5,609.2331539765 | 2013 | 4,678.7441519888 | 2012 | 4,147.4734798165 | 2011 | 4,320.6516910798 | 2010 | 3,740.2723001409 | 2009 | 3,836.756815344 | 2008 | 4,041.8127221592 | 2007 | 3,446.7602382324 | 2006 | 3,107.1364667543 | 2005 | 3,109.2104485882 | 2004 | 2,693.4303982097 | 2003 | 2,536.6318899942 | 2002 | 2,053.6596257031 | 2001 | 1,838.5164889979 | 2000 | 1,354.8877711167 | 1999 | 1,940.5854450449 | 1998 | 2,034.6492295551 | 1997 | 1,982.2429075691 | 1996 | 2,246.5171274399 | 1995 | 1,872.2712742548 | 1994 | 1,763.5280779099 | 1993 | 1,597.3066873546 | 1992 | 2,543.1048830455 | 1991 | 2,855.0745376207 | 1990 | 2,654.4562812449 | 1989 | 2,431.9523058972 | 1988 | 2,791.209935888 | 1987 | 2,069.3794837498 | 1986 | 2,409.3368908941 | 1985 | 2,353.5896393733 | 1984 | 2,676.4797145036 | 1983 | 2,736.8381045938 | 1982 | 3,316.019947259 | 1981 | 3,233.279589949 | 1980 | 2,775.6861849491 | 1979 | 805.26563925513 | 1978 | 1,497.3799525938 | 1977 | 2,140.4234042288 | 1976 | 2,650.0475301898 | 1975 | 1,541.4740363568 | 1974 | 895.59711414941 | 1973 | 730.9109331183 | 1972 | 388.29079384253 | 1971 | 383.09161520924 | 1970 | 327.08325581046 |
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