| Year | Value | | 2021 | 19,349,165.526 | | 2020 | 14,748,517.334 | | 2019 | 46,358,457.951 | | 2018 | 44,417,573.579144 | | 2017 | 42,763,443 | | 2016 | 40,078,714 | | 2015 | 35,687,843 | | 2014 | 33,956,338 | | 2013 | 33,455,251 | | 2012 | 31,672,223.975959 | | 2011 | 29,959,476.404377 | | 2010 | 26,979,676.629682 | | 2009 | 29,108,547 | | 2008 | 29,601,230 | | 2007 | 28,857,440 | | 2006 | 27,454,451 | | 2005 | 26,132,696 | | 2004 | 25,595,676 | | 2003 | 23,454,932 | | 2002 | 22,931,166 | | 2001 | 20,072,980 | | 2000 | 20,898,713 | | 1999 | 19,741,200 | | 1998 | 18,675,500 | | 1997 | 17,889,900 | | 1996 | 17,114,300 | | 1995 | 16,377,900 | | 1994 | 12,894,800 | | 1993 | 11,774,600 | | 1992 | 10,087,800 | | 1991 | 8,893,200 | | 1990 | 8,559,400 | | 1989 | 8,253,400 | | 1988 | 7,860,100 | | 1987 | 7,403,400 | | 1986 | 6,382,000 | | 1985 | 6,027,700 | | 1984 | 5,654,900 | | 1983 | 5,278,900 | | 1982 | 5,201,900 | | 1981 | 5,058,000 | | 1980 | 4,983,800 | | 1979 | 4,918,900 | | 1978 | 4,718,300 | | 1977 | 4,452,000 | | 1976 | 4,080,900 | | 1975 | 3,827,700 | | 1974 | 3,627,100 | | 1973 | 3,682,400 | | 1972 | 3,275,800 | | 1971 | 3,012,300 | | 1970 | 2,881,100 |
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