| Year | Value | | 2021 | 4,486,313.422 | | 2020 | 3,435,350.518 | | 2019 | 6,539,048.3530901 | | 2018 | 7,786,143.9941623 | | 2017 | 4,789,878 | | 2016 | 4,110,075 | | 2015 | 4,613,169 | | 2014 | 4,462,001.6297301 | | 2013 | 4,209,624 | | 2012 | 4,716,148.0807306 | | 2011 | 4,793,913.2741604 | | 2010 | 4,197,375 | | 2009 | 1,365,343 | | 2008 | 1,460,900 | | 2007 | 1,363,435 | | 2006 | 1,307,541 | | 2005 | 747,648 | | 2004 | 540,461 | | 2003 | 520,263 | | 2002 | 520,278 | | 2001 | 519,453 | | 2000 | 507,396 | | 1999 | 419,700 | | 1998 | 313,400 | | 1997 | 318,200 | | 1996 | 221,200 | | 1995 | 547,900 | | 1994 | 664,800 | | 1993 | 608,400 | | 1992 | 646,500 | | 1991 | 930,000 | | 1990 | 964,800 | | 1989 | 848,900 | | 1988 | 995,000 | | 1987 | 1,614,400 | | 1986 | 2,134,000 | | 1985 | 2,575,000 | | 1984 | 1,945,900 | | 1983 | 2,221,300 | | 1982 | 2,138,400 | | 1981 | 2,300,200 | | 1980 | 1,938,500 | | 1979 | 1,581,300 | | 1978 | 1,441,000 | | 1977 | 1,093,900 | | 1976 | 800,800 | | 1975 | 590,400 | | 1974 | 430,300 | | 1973 | 314,100 | | 1972 | 286,800 | | 1971 | 227,100 | | 1970 | 173,000 |
|