| Year | Value | | 2022 | 11,489,998 | | 2021 | 11,141,002 | | 2020 | 10,802,033 | | 2019 | 10,457,037 | | 2018 | 10,117,495 | | 2017 | 9,798,702 | | 2016 | 9,497,598 | | 2015 | 9,202,676 | | 2014 | 8,891,054 | | 2013 | 8,576,379 | | 2012 | 8,294,495 | | 2011 | 8,040,236 | | 2010 | 7,801,494 | | 2009 | 7,592,863 | | 2008 | 7,401,729 | | 2007 | 7,194,563 | | 2006 | 6,982,237 | | 2005 | 6,779,902 | | 2004 | 6,591,476 | | 2003 | 6,422,173 | | 2002 | 6,266,610 | | 2001 | 6,116,068 | | 2000 | 5,970,915 | | 1999 | 5,835,238 | | 1998 | 5,709,230 | | 1997 | 5,594,419 | | 1996 | 5,477,629 | | 1995 | 5,361,003 | | 1994 | 5,270,554 | | 1993 | 5,186,906 | | 1992 | 5,081,816 | | 1991 | 4,974,873 | | 1990 | 4,872,076 | | 1989 | 4,761,116 | | 1988 | 4,646,892 | | 1987 | 4,528,166 | | 1986 | 4,407,080 | | 1985 | 4,282,461 | | 1984 | 4,159,667 | | 1983 | 4,053,107 | | 1982 | 3,952,149 | | 1981 | 3,848,472 | | 1980 | 3,761,613 | | 1979 | 3,675,919 | | 1978 | 3,573,309 | | 1977 | 3,476,354 | | 1976 | 3,386,914 | | 1975 | 3,299,779 | | 1974 | 3,216,639 | | 1973 | 3,137,124 | | 1972 | 3,061,175 | | 1971 | 2,987,436 | | 1970 | 2,914,424 | | 1969 | 2,843,501 | | 1968 | 2,774,978 | | 1967 | 2,709,541 | | 1966 | 2,647,722 | | 1965 | 2,588,122 | | 1964 | 2,530,444 | | 1963 | 2,476,008 | | 1962 | 2,424,668 | | 1961 | 2,374,717 | | 1960 | 2,325,770 |
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