Year | Value | 2021 | 2,182,888 | 2020 | 1,823,594 | 2019 | 7,385,299 | 2018 | 6,464,847 | 2017 | 5,731,748 | 2016 | 4,069,935 | 2015 | 3,752,995 | 2014 | 3,530,851 | 2013 | 3,244,805 | 2012 | 3,481,039 | 2011 | 3,722,729.502639 | 2010 | 4,563,082 | 2009 | 2,597,076 | 2008 | 2,523,966 | 2007 | 2,659,769 | 2006 | 2,627,870 | 2005 | 2,433,213 | 2004 | 2,496,441 | 2003 | 2,185,990 | 2002 | 2,299,218 | 2001 | 2,084,574 | 2000 | 2,112,523 | 1999 | 2,130,000 | 1998 | 2,240,800 | 1997 | 2,113,900 | 1996 | 2,133,400 | 1995 | 1,950,800 | 1994 | 1,756,200 | 1993 | 1,553,800 | 1992 | 1,408,600 | 1991 | 840,100 | 1990 | 965,600 | 1989 | 1,640,600 | 1988 | 1,557,300 | 1987 | 1,511,100 | 1986 | 1,465,700 | 1985 | 1,449,200 | 1984 | 1,497,900 | 1983 | 1,534,500 | 1982 | 1,460,700 | 1981 | 1,252,500 | 1980 | 1,076,200 | 1979 | 965,100 | 1978 | 849,500 | 1977 | 812,300 | 1976 | 737,000 | 1975 | 624,800 | 1974 | 517,900 | 1973 | 453,600 | 1972 | 390,700 | 1971 | 342,200 | 1970 | 315,200 |
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