| Year | Value | | 2022 | 18,366,857 | | 2021 | 17,712,364 | | 2020 | 17,065,912 | | 2019 | 16,422,079 | | 2018 | 15,799,910 | | 2017 | 15,200,819 | | 2016 | 14,624,761 | | 2015 | 14,083,272 | | 2014 | 13,572,412 | | 2013 | 13,079,792 | | 2012 | 12,611,909 | | 2011 | 12,160,717 | | 2010 | 11,725,362 | | 2009 | 11,311,570 | | 2008 | 10,912,187 | | 2007 | 10,548,775 | | 2006 | 10,236,745 | | 2005 | 9,947,826 | | 2004 | 9,675,095 | | 2003 | 9,422,651 | | 2002 | 9,171,636 | | 2001 | 8,917,804 | | 2000 | 8,671,869 | | 1999 | 8,410,987 | | 1998 | 8,147,424 | | 1997 | 7,933,931 | | 1996 | 7,768,268 | | 1995 | 7,616,306 | | 1994 | 7,456,077 | | 1993 | 7,292,851 | | 1992 | 7,111,456 | | 1991 | 6,924,588 | | 1990 | 6,760,310 | | 1989 | 6,595,941 | | 1988 | 6,447,732 | | 1987 | 6,321,839 | | 1986 | 6,193,908 | | 1985 | 6,066,224 | | 1984 | 5,937,085 | | 1983 | 5,808,457 | | 1982 | 5,684,796 | | 1981 | 5,584,738 | | 1980 | 5,498,662 | | 1979 | 5,393,792 | | 1978 | 5,274,881 | | 1977 | 5,160,004 | | 1976 | 5,056,134 | | 1975 | 4,953,141 | | 1974 | 4,848,443 | | 1973 | 4,746,114 | | 1972 | 4,648,587 | | 1971 | 4,555,423 | | 1970 | 4,463,285 | | 1969 | 4,375,752 | | 1968 | 4,291,737 | | 1967 | 4,208,741 | | 1966 | 4,125,995 | | 1965 | 4,040,155 | | 1964 | 3,951,900 | | 1963 | 3,865,257 | | 1962 | 3,780,991 | | 1961 | 3,698,915 | | 1960 | 3,622,031 |
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