| Year | Value | | 2020 | 4,775.0677019328 | | 2019 | 5,335.0805833836 | | 2018 | 5,369.8158049212 | | 2017 | 5,195.3095583203 | | 2016 | 5,191.447111392 | | 2015 | 5,267.2487119758 | | 2014 | 5,905.9656937585 | | 2013 | 5,843.9771970954 | | 2012 | 5,798.6825975079 | | 2011 | 5,347.5067664779 | | 2010 | 5,190.1864684435 | | 2009 | 4,583.9907109326 | | 2008 | 5,143.9764087798 | | 2007 | 4,276.9667029668 | | 2006 | 3,720.0764807005 | | 2005 | 3,183.6980765633 | | 2004 | 2,730.927001605 | | 2003 | 2,377.7093546611 | | 2002 | 2,241.3733626946 | | 2001 | 2,256.7149491712 | | 2000 | 2,313.9549980606 | | 1999 | 2,144.4442199699 | | 1998 | 2,007.8182146323 | | 1997 | 2,067.8211186851 | | 1996 | 1,940.2998556233 | | 1995 | 1,837.4224062625 | | 1994 | 1,698.8651325947 | | 1993 | 1,716.5093051897 | | 1992 | 1,756.3911018257 | | 1991 | 1,629.8919575783 | | 1990 | 1,691.0147058892 | | 1989 | 1,285.5445775724 | | 1988 | 1,282.647711278 | | 1987 | 1,300.8476440485 | | 1986 | 1,289.7446441769 | | 1985 | 1,315.0137186893 | | 1984 | 1,362.0635543356 | | 1983 | 1,401.4622842123 | | 1982 | 1,510.5110340638 | | 1981 | 1,504.3218644769 | | 1980 | 1,380.6737326082 |
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