| Year | Value | | 2021 | 8,005,775 | | 2020 | 6,175,504 | | 2019 | 10,099,031 | | 2018 | 9,880,509 | | 2017 | 9,639,096 | | 2016 | 9,640,591 | | 2015 | 9,498,668 | | 2014 | 9,556,324 | | 2013 | 9,745,498 | | 2012 | 9,864,360 | | 2011 | 10,057,768 | | 2010 | 10,095,197 | | 2009 | 9,182,363 | | 2008 | 9,054,478 | | 2007 | 9,815,504 | | 2006 | 9,738,983 | | 2005 | 9,969,599 | | 2004 | 9,566,226 | | 2003 | 7,789,108 | | 2002 | 8,038,761 | | 2001 | 8,535,240 | | 2000 | 8,820,878 | | 1999 | 8,511,400 | | 1998 | 7,824,400 | | 1997 | 7,942,900 | | 1996 | 8,031,800 | | 1995 | 7,682,200 | | 1994 | 7,250,000 | | 1993 | 6,427,800 | | 1992 | 6,578,100 | | 1991 | 6,623,900 | | 1990 | 6,848,600 | | 1989 | 6,522,100 | | 1988 | 6,628,500 | | 1987 | 6,398,000 | | 1986 | 6,106,000 | | 1985 | 5,553,900 | | 1984 | 5,206,200 | | 1983 | 4,810,900 | | 1982 | 4,572,100 | | 1981 | 4,628,300 | | 1980 | 4,962,700 | | 1979 | 5,041,800 | | 1978 | 4,857,000 | | 1977 | 4,795,900 | | 1976 | 4,690,500 | | 1975 | 4,576,100 | | 1974 | 4,650,400 | | 1973 | 5,058,200 | | 1972 | 4,985,200 | | 1971 | 4,999,200 | | 1970 | 5,099,200 |
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