| Year | Value | | 2021 | 3,157.7722574439 | | 2020 | 3,184.2006362515 | | 2019 | 4,791.9187010995 | | 2018 | 4,699.0224814254 | | 2017 | 3,651.6204077959 | | 2016 | 3,976.1468965169 | | 2015 | 7,320.1866637024 | | 2014 | 6,841.540008824 | | 2013 | 6,207.9286366745 | | 2012 | 5,371.7237447069 | | 2011 | 4,531.5817326453 | | 2010 | 5,506.3507711758 | | 2009 | 5,758.8892611075 | | 2008 | 5,072.8809576311 | | 2007 | 4,354.2516301023 | | 2006 | 3,871.7053180315 | | 2005 | 2,655.5364877886 | | 2004 | 2,269.8464130698 | | 2003 | 2,011.1879934202 | | 2002 | 1,740.3419833759 | | 2001 | 1,175.2663931594 | | 2000 | 1,509.0572215353 | | 1999 | 1,526.1135316421 | | 1998 | 2,033.0606335078 | | 1997 | 1,686.1801924976 | | 1996 | 1,633.5029966987 | | 1995 | 1,377.5741543752 | | 1994 | 1,196.1087799917 | | 1993 | 805.64995448067 | | 1992 | 767.5478746512 | | 1991 | 877.75134602968 | | 1990 | 758.82949019218 | | 1989 | 1,112.1040785678 | | 1988 | 2,503.3522287348 | | 1987 | 2,114.6645961568 | | 1986 | 1,961.7007047016 | | 1985 | 1,937.3042039839 | | 1984 | 1,980.5952037223 | | 1983 | 1,999.7417861269 | | 1982 | 2,135.6938663392 | | 1981 | 2,082.7343773448 | | 1980 | 1,766.5189093196 |
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