| Year | Value | | 2021 | 15,075,193.281 | | 2020 | 10,279,740.062 | | 2019 | 28,357,862.062201 | | 2018 | 28,768,397.360006 | | 2017 | 21,624,757.05 | | 2016 | 20,633,300 | | 2015 | 21,230,480 | | 2014 | 19,349,770.895976 | | 2013 | 19,925,850.818 | | 2012 | 20,515,501.676293 | | 2011 | 20,387,700.772886 | | 2010 | 17,819,048.659306 | | 2001 | 5,129,614 | | 2000 | 5,605,843 | | 1999 | 5,720,100 | | 1998 | 5,677,400 | | 1997 | 5,219,400 | | 1996 | 5,427,100 | | 1995 | 5,618,900 | | 1994 | 5,857,800 | | 1993 | 5,354,400 | | 1992 | 5,674,400 | | 1991 | 6,057,800 | | 1990 | 7,398,600 | | 1989 | 7,581,600 | | 1988 | 8,313,100 | | 1987 | 8,136,900 | | 1986 | 8,586,600 | | 1985 | 9,315,600 | | 1984 | 8,906,500 | | 1983 | 9,138,600 | | 1982 | 8,987,200 | | 1981 | 8,800,000 | | 1980 | 8,054,300 | | 1979 | 7,333,900 | | 1978 | 6,456,000 | | 1977 | 5,693,100 | | 1976 | 5,416,400 | | 1975 | 4,279,000 | | 1974 | 3,830,100 | | 1973 | 3,299,800 | | 1972 | 2,900,000 | | 1971 | 2,847,200 | | 1970 | 2,589,800 |
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