Year | Value | 2022 | 28,935,469 | 2021 | 29,720,471 | 2020 | 30,491,936 | 2019 | 31,316,899 | 2018 | 32,106,934 | 2017 | 32,807,202 | 2016 | 33,295,350 | 2015 | 33,503,308 | 2014 | 33,531,586 | 2013 | 33,484,948 | 2012 | 33,333,708 | 2011 | 33,124,134 | 2010 | 33,022,634 | 2009 | 32,917,389 | 2008 | 32,707,946 | 2007 | 32,429,075 | 2006 | 32,237,474 | 2005 | 32,044,924 | 2004 | 31,839,391 | 2003 | 31,669,619 | 2002 | 31,591,205 | 2001 | 31,644,022 | 2000 | 31,744,456 | 1999 | 31,866,313 | 1998 | 32,072,905 | 1997 | 32,249,993 | 1996 | 32,307,669 | 1995 | 32,405,102 | 1994 | 32,630,122 | 1993 | 32,915,074 | 1992 | 33,198,799 | 1991 | 33,521,622 | 1990 | 33,806,798 | 1989 | 33,951,237 | 1988 | 33,890,923 | 1987 | 33,722,018 | 1986 | 33,422,220 | 1985 | 32,991,662 | 1984 | 32,560,891 | 1983 | 32,147,991 | 1982 | 31,700,542 | 1981 | 31,259,432 | 1980 | 30,882,660 | 1979 | 30,580,933 | 1978 | 30,281,583 | 1977 | 29,945,724 | 1976 | 29,457,857 | 1975 | 28,269,580 | 1974 | 26,543,488 | 1973 | 24,879,932 | 1972 | 23,429,949 | 1971 | 22,615,082 | 1970 | 22,995,321 | 1969 | 24,159,007 | 1968 | 25,479,512 | 1967 | 26,772,202 | 1966 | 27,509,841 | 1965 | 27,532,025 | 1964 | 27,027,264 | 1963 | 26,147,551 | 1962 | 25,317,965 | 1961 | 24,846,199 | 1960 | 24,868,083 |
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