| Year | Value | | 2021 | 153,242 | | 2020 | 407,291 | | 2019 | 1,726,868 | | 2018 | 1,745,291 | | 2017 | 1,674,395 | | 2016 | 1,593,666 | | 2015 | 1,466,527 | | 2014 | 1,354,388 | | 2013 | 1,318,052 | | 2012 | 1,313,976 | | 2011 | 1,321,491 | | 2010 | 1,265,458 | | 2009 | 1,092,580 | | 2008 | 1,256,746 | | 2007 | 1,277,957 | | 2006 | 1,056,496 | | 2005 | 1,145,737 | | 2004 | 1,088,696 | | 2003 | 1,042,773 | | 2002 | 1,029,466 | | 2001 | 1,002,282 | | 2000 | 949,085 | | 1999 | 823,200 | | 1998 | 847,500 | | 1997 | 803,900 | | 1996 | 716,900 | | 1995 | 675,800 | | 1994 | 635,900 | | 1993 | 581,900 | | 1992 | 578,100 | | 1991 | 525,300 | | 1990 | 519,700 | | 1989 | 423,800 | | 1988 | 383,700 | | 1987 | 285,400 | | 1986 | 199,700 | | 1985 | 182,800 | | 1984 | 155,000 | | 1983 | 122,900 | | 1982 | 106,400 | | 1981 | 102,200 | | 1980 | 83,700 | | 1979 | 82,300 | | 1978 | 55,000 | | 1977 | 30,100 | | 1976 | 33,000 | | 1975 | 30,000 | | 1974 | 28,000 | | 1973 | 24,000 | | 1972 | 25,200 | | 1971 | 24,200 | | 1970 | 23,000 |
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