| Year | Value | | 2021 | 2,915,300.394 | | 2020 | 2,301,206.386 | | 2019 | 5,900,296.733 | | 2018 | 5,608,067.9394902 | | 2017 | 5,481,436 | | 2016 | 5,468,736 | | 2015 | 5,291,624 | | 2014 | 5,170,163.1976493 | | 2013 | 5,145,234.909 | | 2012 | 5,278,710.4534897 | | 2011 | 5,429,662.6878213 | | 2010 | 5,260,808.8053793 | | 2009 | 4,827,314 | | 2008 | 4,959,760 | | 2007 | 4,917,391 | | 2006 | 4,657,953 | | 2005 | 4,431,467 | | 2004 | 4,413,329 | | 2003 | 4,139,732 | | 2002 | 3,991,441 | | 2001 | 4,140,156 | | 2000 | 4,149,031 | | 1999 | 3,885,000 | | 1998 | 3,625,800 | | 1997 | 3,461,900 | | 1996 | 3,106,900 | | 1995 | 2,858,600 | | 1994 | 2,733,400 | | 1993 | 2,611,700 | | 1992 | 2,473,800 | | 1991 | 2,235,100 | | 1990 | 2,235,100 | | 1989 | 2,095,700 | | 1988 | 1,963,100 | | 1987 | 1,796,000 | | 1986 | 1,663,600 | | 1985 | 1,593,800 | | 1984 | 1,545,500 | | 1983 | 1,506,400 | | 1982 | 1,486,600 | | 1981 | 1,453,500 | | 1980 | 1,503,800 | | 1979 | 1,515,100 | | 1978 | 1,479,600 | | 1977 | 1,442,900 | | 1976 | 1,444,900 | | 1975 | 1,383,300 | | 1974 | 1,415,900 | | 1973 | 1,379,200 | | 1972 | 1,383,300 | | 1971 | 1,299,100 | | 1970 | 1,211,800 |
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