| Year | Value | | 2022 | 22,297,691 | | 2021 | 21,575,094 | | 2020 | 20,928,505 | | 2019 | 20,330,669 | | 2018 | 19,771,351 | | 2017 | 19,226,689 | | 2016 | 18,684,893 | | 2015 | 18,143,456 | | 2014 | 17,604,760 | | 2013 | 17,077,307 | | 2012 | 16,566,469 | | 2011 | 16,071,758 | | 2010 | 15,589,649 | | 2009 | 15,118,868 | | 2008 | 14,661,735 | | 2007 | 14,216,176 | | 2006 | 13,788,204 | | 2005 | 13,384,896 | | 2004 | 13,003,417 | | 2003 | 12,643,653 | | 2002 | 12,303,206 | | 2001 | 11,971,696 | | 2000 | 11,639,943 | | 1999 | 11,285,067 | | 1998 | 10,923,899 | | 1997 | 10,603,080 | | 1996 | 10,315,813 | | 1995 | 10,039,516 | | 1994 | 9,796,668 | | 1993 | 9,572,848 | | 1992 | 9,328,616 | | 1991 | 9,079,400 | | 1990 | 8,832,655 | | 1989 | 8,590,790 | | 1988 | 8,375,348 | | 1987 | 8,178,951 | | 1986 | 7,982,060 | | 1985 | 7,791,327 | | 1984 | 7,611,672 | | 1983 | 7,438,316 | | 1982 | 7,264,139 | | 1981 | 7,093,533 | | 1980 | 6,940,595 | | 1979 | 6,799,984 | | 1978 | 6,654,546 | | 1977 | 6,513,570 | | 1976 | 6,374,710 | | 1975 | 6,228,516 | | 1974 | 6,081,903 | | 1973 | 5,936,363 | | 1972 | 5,795,149 | | 1971 | 5,658,769 | | 1970 | 5,524,961 | | 1969 | 5,398,403 | | 1968 | 5,277,030 | | 1967 | 5,157,019 | | 1966 | 5,039,286 | | 1965 | 4,921,809 | | 1964 | 4,804,564 | | 1963 | 4,692,198 | | 1962 | 4,585,206 | | 1961 | 4,481,229 | | 1960 | 4,383,673 |
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