| Year | Value | | 2022 | 17,357,886 | | 2021 | 17,109,746 | | 2020 | 16,858,333 | | 2019 | 16,604,026 | | 2018 | 16,346,950 | | 2017 | 16,087,418 | | 2016 | 15,827,690 | | 2015 | 15,567,419 | | 2014 | 15,306,316 | | 2013 | 15,043,981 | | 2012 | 14,781,942 | | 2011 | 14,521,515 | | 2010 | 14,259,687 | | 2009 | 14,000,190 | | 2008 | 13,739,299 | | 2007 | 13,477,017 | | 2006 | 13,213,330 | | 2005 | 12,948,292 | | 2004 | 12,682,108 | | 2003 | 12,415,334 | | 2002 | 12,147,518 | | 2001 | 11,871,565 | | 2000 | 11,589,761 | | 1999 | 11,311,078 | | 1998 | 11,046,215 | | 1997 | 10,788,362 | | 1996 | 10,536,942 | | 1995 | 10,286,786 | | 1994 | 10,037,522 | | 1993 | 9,790,619 | | 1992 | 9,544,055 | | 1991 | 9,296,814 | | 1990 | 9,050,115 | | 1989 | 8,805,995 | | 1988 | 8,566,331 | | 1987 | 8,332,446 | | 1986 | 8,104,921 | | 1985 | 7,884,034 | | 1984 | 7,669,863 | | 1983 | 7,462,585 | | 1982 | 7,262,658 | | 1981 | 7,071,186 | | 1980 | 6,890,346 | | 1979 | 6,720,582 | | 1978 | 6,561,919 | | 1977 | 6,412,667 | | 1976 | 6,269,983 | | 1975 | 6,131,151 | | 1974 | 5,994,300 | | 1973 | 5,858,466 | | 1972 | 5,723,759 | | 1971 | 5,589,563 | | 1970 | 5,455,197 | | 1969 | 5,320,100 | | 1968 | 5,184,095 | | 1967 | 5,047,435 | | 1966 | 4,910,790 | | 1965 | 4,774,984 | | 1964 | 4,640,795 | | 1963 | 4,508,444 | | 1962 | 4,378,604 | | 1961 | 4,251,911 | | 1960 | 4,128,880 |
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