| Year | Value | | 2021 | 2,387,932.535 | | 2020 | 1,939,625.837 | | 2019 | 4,882,120.543 | | 2018 | 4,585,315.9394902 | | 2017 | 4,506,736 | | 2016 | 4,494,509 | | 2015 | 4,314,391 | | 2014 | 4,179,438.3976493 | | 2013 | 4,152,058.909 | | 2012 | 4,337,873.6218386 | | 2011 | 4,456,459.4754315 | | 2010 | 4,337,753.8053793 | | 2009 | 4,551,117 | | 2008 | 4,670,197 | | 2007 | 4,637,826 | | 2006 | 4,398,057 | | 2005 | 4,181,132 | | 2004 | 3,894,383 | | 2003 | 3,668,641 | | 2002 | 3,525,731 | | 2001 | 3,620,776 | | 2000 | 3,631,804 | | 1999 | 3,400,500 | | 1998 | 3,162,400 | | 1997 | 3,005,300 | | 1996 | 2,697,200 | | 1995 | 2,469,700 | | 1994 | 2,328,000 | | 1993 | 2,215,700 | | 1992 | 2,098,100 | | 1991 | 1,877,700 | | 1990 | 1,807,500 | | 1989 | 1,672,000 | | 1988 | 1,558,800 | | 1987 | 1,397,800 | | 1986 | 1,274,400 | | 1985 | 1,240,800 | | 1984 | 1,203,600 | | 1983 | 1,170,400 | | 1982 | 1,186,400 | | 1981 | 1,147,100 | | 1980 | 1,174,400 | | 1979 | 1,186,200 | | 1978 | 1,166,900 | | 1977 | 1,131,400 | | 1976 | 1,122,700 | | 1975 | 1,098,200 | | 1974 | 1,133,900 | | 1973 | 1,100,500 | | 1972 | 1,109,000 | | 1971 | 1,046,400 | | 1970 | 996,500 |
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