| Year | Value | | 2021 | 8,726,345 | | 2020 | 5,647,917 | | 2019 | 16,124,738.33 | | 2018 | 15,125,933.51526 | | 2017 | 13,852,857 | | 2016 | 12,689,082 | | 2015 | 11,237,054 | | 2014 | 11,152,236 | | 2013 | 8,761,116 | | 2012 | 8,785,275.4559278 | | 2011 | 9,569,211.4194176 | | 2010 | 10,352,657.531181 | | 2009 | 8,795,133 | | 2008 | 9,442,743 | | 2007 | 10,206,223 | | 2006 | 9,481,314 | | 2005 | 9,452,219 | | 2004 | 9,276,954 | | 2003 | 7,518,932 | | 2002 | 7,579,225 | | 2001 | 8,430,333 | | 2000 | 7,937,434 | | 1999 | 6,590,700 | | 1998 | 6,403,400 | | 1997 | 7,060,800 | | 1996 | 6,396,000 | | 1995 | 6,006,000 | | 1994 | 5,812,900 | | 1993 | 5,478,100 | | 1992 | 5,465,500 | | 1991 | 4,937,000 | | 1990 | 6,134,600 | | 1989 | 6,632,000 | | 1988 | 6,659,700 | | 1987 | 6,567,600 | | 1986 | 6,479,500 | | 1985 | 7,456,600 | | 1984 | 6,878,400 | | 1983 | 5,811,800 | | 1982 | 5,633,900 | | 1981 | 4,900,700 | | 1980 | 4,891,300 | | 1979 | 5,021,100 | | 1978 | 4,670,500 | | 1977 | 3,883,900 | | 1976 | 3,541,000 | | 1975 | 2,832,600 | | 1974 | 2,304,600 | | 1973 | 2,802,600 | | 1972 | 2,412,600 | | 1971 | 2,021,400 | | 1970 | 1,614,700 |
|