| Year | Value | | 2021 | 3,692.2001799574 | | 2020 | 3,504.2954158498 | | 2019 | 4,277.0065442121 | | 2018 | 4,144.7973151393 | | 2017 | 3,639.1644677467 | | 2016 | 3,410.714279383 | | 2015 | 3,486.5344089056 | | 2014 | 4,747.7345825595 | | 2013 | 5,134.8268144192 | | 2012 | 4,971.7759586945 | | 2011 | 4,325.0463880998 | | 2010 | 3,526.3939051543 | | 2009 | 3,047.779846271 | | 2008 | 3,538.1583726233 | | 2007 | 2,284.1966785672 | | 2006 | 1,574.5049013952 | | 2005 | 1,147.0146523557 | | 2004 | 953.06740472959 | | 2003 | 609.54749133261 | | 2002 | 924.48308385752 | | 2001 | 1,045.36784663 | | 2000 | 1,520.4461305503 | | 1999 | 1,214.2718239082 | | 1998 | 661.82516453419 | | 1997 | 678.38902644072 | | 1996 | 360.95200729317 | | 1995 | 465.79907563747 | | 1994 | 145.74898009583 | | 1990 | 7,410.9552152898 | | 1989 | 2,451.0090517435 | | 1988 | 2,488.1101810031 | | 1987 | 2,201.9529989113 | | 1986 | 1,938.1827503943 | | 1985 | 1,996.1592952584 | | 1984 | 2,090.2371572097 | | 1983 | 1,832.014987378 | | 1982 | 1,881.6261960887 | | 1981 | 1,734.4825802822 | | 1980 | 1,919.9802899555 |
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