| Year | Value | | 2022 | 29,018,008 | | 2021 | 26,632,078 | | 2020 | 24,455,467 | | 2019 | 22,452,888 | | 2018 | 20,871,826 | | 2017 | 19,600,129 | | 2016 | 18,671,838 | | 2015 | 17,992,820 | | 2014 | 17,458,799 | | 2013 | 17,071,362 | | 2012 | 16,813,538 | | 2011 | 16,560,418 | | 2010 | 16,396,055 | | 2009 | 16,385,636 | | 2008 | 16,395,741 | | 2007 | 16,251,681 | | 2006 | 15,904,749 | | 2005 | 15,447,519 | | 2004 | 14,951,989 | | 2003 | 14,429,994 | | 2002 | 13,944,985 | | 2001 | 13,506,206 | | 2000 | 13,100,720 | | 1999 | 12,770,478 | | 1998 | 12,408,481 | | 1997 | 11,984,596 | | 1996 | 11,647,599 | | 1995 | 11,308,930 | | 1994 | 10,865,742 | | 1993 | 10,415,229 | | 1992 | 10,061,685 | | 1991 | 9,775,538 | | 1990 | 9,499,529 | | 1989 | 9,269,036 | | 1988 | 9,090,484 | | 1987 | 8,855,174 | | 1986 | 8,540,103 | | 1985 | 8,233,008 | | 1984 | 7,960,715 | | 1983 | 7,713,075 | | 1982 | 7,525,955 | | 1981 | 7,420,192 | | 1980 | 7,336,883 | | 1979 | 7,195,194 | | 1978 | 7,024,220 | | 1977 | 6,876,163 | | 1976 | 6,708,890 | | 1975 | 6,477,042 | | 1974 | 6,186,584 | | 1973 | 5,865,617 | | 1972 | 5,570,763 | | 1971 | 5,314,074 | | 1970 | 5,102,319 | | 1969 | 4,980,295 | | 1968 | 4,910,023 | | 1967 | 4,832,167 | | 1966 | 4,726,947 | | 1965 | 4,587,962 | | 1964 | 4,473,407 | | 1963 | 4,397,322 | | 1962 | 4,326,313 | | 1961 | 4,342,755 | | 1960 | 4,497,763 |
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