| Year | Value | | 2022 | 17,457,353 | | 2021 | 17,187,080 | | 2020 | 16,911,828 | | 2019 | 16,648,139 | | 2018 | 16,400,316 | | 2017 | 16,164,212 | | 2016 | 15,935,960 | | 2015 | 15,704,718 | | 2014 | 15,453,422 | | 2013 | 15,174,327 | | 2012 | 14,860,975 | | 2011 | 14,513,669 | | 2010 | 14,152,317 | | 2009 | 13,785,186 | | 2008 | 13,414,489 | | 2007 | 13,051,336 | | 2006 | 12,693,387 | | 2005 | 12,332,276 | | 2004 | 11,967,626 | | 2003 | 11,592,377 | | 2002 | 11,217,650 | | 2001 | 10,869,385 | | 2000 | 10,552,226 | | 1999 | 10,263,438 | | 1998 | 10,004,582 | | 1997 | 9,759,475 | | 1996 | 9,510,147 | | 1995 | 9,259,977 | | 1994 | 9,018,204 | | 1993 | 8,788,277 | | 1992 | 8,573,327 | | 1991 | 8,380,278 | | 1990 | 8,209,783 | | 1989 | 8,058,408 | | 1988 | 7,930,400 | | 1987 | 7,815,540 | | 1986 | 7,694,825 | | 1985 | 7,562,604 | | 1984 | 7,415,202 | | 1983 | 7,273,129 | | 1982 | 7,114,332 | | 1981 | 6,918,434 | | 1980 | 6,709,891 | | 1979 | 6,490,206 | | 1978 | 6,258,736 | | 1977 | 6,026,031 | | 1976 | 5,803,653 | | 1975 | 5,588,990 | | 1974 | 5,386,539 | | 1973 | 5,207,746 | | 1972 | 5,050,943 | | 1971 | 4,910,552 | | 1970 | 4,787,091 | | 1969 | 4,676,755 | | 1968 | 4,571,663 | | 1967 | 4,471,105 | | 1966 | 4,369,474 | | 1965 | 4,263,210 | | 1964 | 4,156,713 | | 1963 | 4,052,199 | | 1962 | 3,952,025 | | 1961 | 3,857,251 | | 1960 | 3,768,032 |
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