Year | Value | 2021 | 2,792.166962966 | 2020 | 2,968.8891727481 | 2019 | 3,149.00384898 | 2018 | 2,918.5955623001 | 2017 | 2,434.2394930061 | 2016 | 2,700.4382302011 | 2015 | 2,891.2734339202 | 2014 | 3,219.9675904986 | 2013 | 3,532.1785976574 | 2012 | 3,360.8244082312 | 2011 | 2,607.8500672486 | 2010 | 1,873.3114622791 | 2009 | 1,321.1734136035 | 2008 | 1,645.427022665 | 2007 | 1,243.7733564632 | 2006 | 998.14223288722 | 2005 | 802.13763664873 | 2004 | 667.37636303773 | 2003 | 553.97062257349 | 2002 | 484.53039007651 | 2001 | 441.695053772 | 2000 | 405.7875029889 | 1999 | 390.52778736796 | 1998 | 416.02696526992 | 1997 | 435.19733236033 | 1996 | 519.51342076154 | 1995 | 534.2650217424 | 1994 | 344.06529984072 | 1993 | 300.5445347367 | 1992 | 516.97769883835 | 1991 | 945.41194500555 | 1990 | 844.46973328958 | 1989 | 1,140.9246646745 | 1988 | 1,140.6204341017 | 1987 | 1,133.7122186018 | 1986 | 1,129.1480473418 | 1985 | 838.58812225439 | 1984 | 839.1911291953 | 1983 | 1,131.9076034619 | 1982 | 1,091.506001536 | 1981 | 1,014.7551981419 |
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