Year | Value | 2022 | 37,176,999 | 2021 | 37,782,412 | 2020 | 38,429,123 | 2019 | 38,794,562 | 2018 | 39,066,496 | 2017 | 39,214,576 | 2016 | 39,101,005 | 2015 | 38,904,011 | 2014 | 38,939,162 | 2013 | 39,081,333 | 2012 | 39,175,624 | 2011 | 39,307,403 | 2010 | 39,463,784 | 2009 | 39,276,938 | 2008 | 38,919,413 | 2007 | 38,493,474 | 2006 | 38,026,994 | 2005 | 37,502,422 | 2004 | 36,969,923 | 2003 | 36,411,037 | 2002 | 35,868,462 | 2001 | 35,566,544 | 2000 | 35,238,619 | 1999 | 34,831,989 | 1998 | 34,738,687 | 1997 | 34,788,149 | 1996 | 34,389,985 | 1995 | 33,332,290 | 1994 | 32,078,008 | 1993 | 30,840,169 | 1992 | 29,561,445 | 1991 | 28,483,030 | 1990 | 28,214,860 | 1989 | 28,321,202 | 1988 | 28,142,628 | 1987 | 27,947,053 | 1986 | 27,842,719 | 1985 | 27,606,710 | 1984 | 27,218,014 | 1983 | 26,862,957 | 1982 | 26,545,145 | 1981 | 26,315,142 | 1980 | 26,322,755 | 1979 | 26,606,672 | 1978 | 26,848,519 | 1977 | 26,925,486 | 1976 | 26,846,680 | 1975 | 26,452,289 | 1974 | 25,740,550 | 1973 | 25,152,131 | 1972 | 24,678,374 | 1971 | 24,119,747 | 1970 | 23,692,339 | 1969 | 23,253,387 | 1968 | 22,230,283 | 1967 | 20,956,291 | 1966 | 19,940,824 | 1965 | 19,138,493 | 1964 | 18,892,383 | 1963 | 19,400,528 | 1962 | 20,276,906 | 1961 | 21,094,691 | 1960 | 21,673,509 |
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