| Year | Value | | 2021 | 1,132,655.764 | | 2020 | 1,506,581.713 | | 2019 | 3,701,663.849 | | 2018 | 3,407,788.432903 | | 2017 | 3,149,037 | | 2016 | 2,741,388 | | 2015 | 2,095,503 | | 2014 | 1,926,969 | | 2013 | 1,572,120 | | 2012 | 1,663,425.4345762 | | 2011 | 1,539,676 | | 2010 | 924,207 | | 2009 | 1,527,346 | | 2008 | 1,637,923 | | 2007 | 1,662,866 | | 2006 | 1,620,895 | | 2005 | 1,503,624 | | 2004 | 1,392,244 | | 2003 | 1,117,208 | | 2002 | 1,186,162 | | 2001 | 398,216 | | 2000 | 437,600 | | 1999 | 536,800 | | 1998 | 333,200 | | 1997 | 334,500 | | 1996 | 334,500 | | 1995 | 334,500 | | 1994 | 318,500 | | 1993 | 318,500 | | 1992 | 318,500 | | 1991 | 318,500 | | 1990 | 318,500 | | 1989 | 308,000 | | 1988 | 516,000 | | 1987 | 512,000 | | 1986 | 511,000 | | 1985 | 509,000 | | 1984 | 487,000 | | 1983 | 517,000 | | 1982 | 515,000 | | 1981 | 500,000 | | 1980 | 481,000 | | 1979 | 460,000 | | 1978 | 425,000 | | 1977 | 410,000 | | 1976 | 396,000 | | 1975 | 391,300 | | 1974 | 388,300 | | 1973 | 405,000 | | 1972 | 393,000 | | 1971 | 380,500 | | 1970 | 345,800 |
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