| Year | Value | | 2021 | 21,246,706.426 | | 2020 | 17,000,506.794 | | 2019 | 36,727,918.809941 | | 2018 | 38,163,132.407357 | | 2017 | 32,239,144.630311 | | 2016 | 26,570,744 | | 2015 | 25,261,970 | | 2014 | 25,368,159.471281 | | 2013 | 24,484,619.146004 | | 2012 | 22,107,026.960992 | | 2011 | 21,331,556.216019 | | 2010 | 17,654,275.9209 | | 2009 | 11,608,385 | | 2008 | 11,082,489 | | 2007 | 10,839,781 | | 2006 | 10,414,732 | | 2005 | 9,802,612 | | 2004 | 9,056,444 | | 2003 | 7,524,047 | | 2002 | 7,387,912 | | 2001 | 7,411,821 | | 2000 | 7,554,646 | | 1999 | 7,515,100 | | 1998 | 7,616,900 | | 1997 | 7,529,200 | | 1996 | 7,578,500 | | 1995 | 7,254,800 | | 1994 | 7,714,900 | | 1993 | 7,175,900 | | 1992 | 7,298,800 | | 1991 | 7,140,900 | | 1990 | 7,960,400 | | 1989 | 7,604,700 | | 1988 | 8,562,800 | | 1987 | 7,658,500 | | 1986 | 7,547,000 | | 1985 | 7,444,900 | | 1984 | 7,523,200 | | 1983 | 7,409,200 | | 1982 | 7,312,600 | | 1981 | 6,950,300 | | 1980 | 6,523,600 | | 1979 | 6,108,400 | | 1978 | 5,137,300 | | 1977 | 4,914,900 | | 1976 | 4,915,900 | | 1975 | 4,109,300 | | 1974 | 3,969,800 | | 1973 | 3,816,800 | | 1972 | 3,129,100 | | 1971 | 3,045,500 | | 1970 | 2,730,800 |
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