| Year | Value | | 2021 | 13,695,897.024 | | 2020 | 12,744,853.781 | | 2019 | 21,641,449.393 | | 2018 | 23,029,380 | | 2017 | 26,858,178.78 | | 2016 | 17,084,581 | | 2015 | 13,873,256 | | 2014 | 16,825,260.830132 | | 2013 | 16,580,818.00521 | | 2012 | 17,687,478.519721 | | 2011 | 19,113,946.162247 | | 2010 | 18,760,850.381485 | | 2009 | 13,052,716 | | 2008 | 12,029,236 | | 2007 | 13,915,755 | | 2006 | 13,623,038 | | 2005 | 12,708,354 | | 2004 | 11,877,705 | | 2003 | 16,301,238 | | 2002 | 9,891,522 | | 2001 | 16,485,326 | | 2000 | 8,722,145 | | 1999 | 8,277,300 | | 1998 | 9,200,400 | | 1997 | 9,804,100 | | 1996 | 7,609,600 | | 1995 | 6,290,600 | | 1994 | 5,803,500 | | 1993 | 5,351,800 | | 1992 | 4,895,600 | | 1991 | 5,537,500 | | 1990 | 5,632,600 | | 1989 | 4,882,600 | | 1988 | 4,486,800 | | 1987 | 4,846,900 | | 1986 | 4,670,600 | | 1985 | 3,422,000 | | 1984 | 4,087,800 | | 1983 | 3,190,900 | | 1982 | 2,127,800 | | 1981 | 1,539,700 | | 1980 | 1,998,100 | | 1979 | 2,168,700 | | 1978 | 3,333,500 | | 1977 | 3,005,400 | | 1976 | 2,499,100 | | 1975 | 1,949,400 | | 1974 | 1,361,900 | | 1973 | 1,141,600 | | 1972 | 894,800 | | 1971 | 761,400 | | 1970 | 715,600 |
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