| Year | Value | | 2022 | 21,621,634 | | 2021 | 21,265,699 | | 2020 | 20,864,986 | | 2019 | 20,323,101 | | 2018 | 19,638,032 | | 2017 | 18,904,238 | | 2016 | 18,182,854 | | 2015 | 17,468,618 | | 2014 | 16,769,035 | | 2013 | 16,059,131 | | 2012 | 15,364,928 | | 2011 | 14,718,489 | | 2010 | 14,062,790 | | 2009 | 13,394,241 | | 2008 | 12,706,631 | | 2007 | 12,011,761 | | 2006 | 11,368,723 | | 2005 | 10,747,616 | | 2004 | 10,130,796 | | 2003 | 9,573,106 | | 2002 | 9,099,401 | | 2001 | 8,669,042 | | 2000 | 8,263,260 | | 1999 | 7,895,966 | | 1998 | 7,573,292 | | 1997 | 7,285,836 | | 1996 | 7,021,604 | | 1995 | 6,760,123 | | 1994 | 6,467,019 | | 1993 | 6,153,509 | | 1992 | 5,864,275 | | 1991 | 5,608,680 | | 1990 | 5,369,776 | | 1989 | 5,120,643 | | 1988 | 4,872,162 | | 1987 | 4,642,423 | | 1986 | 4,422,113 | | 1985 | 4,209,240 | | 1984 | 4,008,010 | | 1983 | 3,806,966 | | 1982 | 3,612,122 | | 1981 | 3,437,998 | | 1980 | 3,283,473 | | 1979 | 3,138,439 | | 1978 | 2,994,997 | | 1977 | 2,855,695 | | 1976 | 2,729,848 | | 1975 | 2,607,784 | | 1974 | 2,484,077 | | 1973 | 2,367,172 | | 1972 | 2,262,317 | | 1971 | 2,176,274 | | 1970 | 2,110,767 | | 1969 | 2,051,475 | | 1968 | 1,982,356 | | 1967 | 1,910,875 | | 1966 | 1,849,910 | | 1965 | 1,803,253 | | 1964 | 1,767,093 | | 1963 | 1,736,539 | | 1962 | 1,710,435 | | 1961 | 1,703,189 | | 1960 | 1,726,684 |
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