| Year | Value | | 2021 | 1,840,268 | | 2020 | 1,451,359 | | 2019 | 6,440,562 | | 2018 | 5,877,003 | | 2017 | 5,190,484 | | 2016 | 5,220,218 | | 2015 | 5,313,756 | | 2014 | 5,171,496 | | 2013 | 4,626,648 | | 2012 | 5,861,786.9990069 | | 2011 | 5,590,998.0406064 | | 2010 | 6,028,980 | | 2009 | 5,215,512 | | 2004 | 2,284,547 | | 2003 | 1,850,491 | | 2002 | 1,255,713 | | 2001 | 1,250,076 | | 2000 | 1,382,461 | | 1999 | 1,307,000 | | 1998 | 1,207,000 | | 1997 | 1,164,600 | | 1996 | 1,200,300 | | 1995 | 1,072,500 | | 1994 | 1,150,600 | | 1993 | 1,080,000 | | 1992 | 981,100 | | 1991 | 875,500 | | 1990 | 770,900 | | 1989 | 752,800 | | 1988 | 698,400 | | 1987 | 621,500 | | 1986 | 647,400 | | 1985 | 717,500 | | 1984 | 674,200 | | 1983 | 601,800 | | 1982 | 569,800 | | 1981 | 577,800 | | 1980 | 521,500 | | 1979 | 456,500 | | 1978 | 374,500 | | 1977 | 299,800 | | 1976 | 240,100 | | 1975 | 173,000 | | 1974 | 127,500 | | 1973 | 350,000 | | 1972 | 320,000 | | 1971 | 280,000 | | 1970 | 241,000 |
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