Year | Value | 2022 | 36,935,646 | 2021 | 36,962,881 | 2020 | 36,923,802 | 2019 | 36,880,970 | 2018 | 37,086,182 | 2017 | 37,413,798 | 2016 | 37,920,093 | 2015 | 38,476,371 | 2014 | 38,887,531 | 2013 | 39,142,868 | 2012 | 39,307,438 | 2011 | 39,244,357 | 2010 | 39,219,346 | 2009 | 39,388,392 | 2008 | 39,657,169 | 2007 | 39,816,476 | 2006 | 40,002,485 | 2005 | 40,124,457 | 2004 | 39,948,443 | 2003 | 39,577,194 | 2002 | 39,158,730 | 2001 | 38,692,384 | 2000 | 38,189,922 | 1999 | 37,673,067 | 1998 | 37,138,818 | 1997 | 36,620,104 | 1996 | 36,304,074 | 1995 | 35,938,784 | 1994 | 35,507,515 | 1993 | 35,374,939 | 1992 | 35,434,594 | 1991 | 35,031,667 | 1990 | 33,920,212 | 1989 | 32,709,577 | 1988 | 31,510,178 | 1987 | 30,201,950 | 1986 | 29,163,921 | 1985 | 28,959,643 | 1984 | 29,061,476 | 1983 | 28,925,892 | 1982 | 28,784,518 | 1981 | 28,644,510 | 1980 | 28,366,006 | 1979 | 27,976,562 | 1978 | 27,517,636 | 1977 | 27,105,009 | 1976 | 26,796,772 | 1975 | 26,682,193 | 1974 | 26,828,154 | 1973 | 27,052,799 | 1972 | 27,222,456 | 1971 | 27,399,320 | 1970 | 27,464,509 | 1969 | 27,411,587 | 1968 | 27,468,017 | 1967 | 27,541,849 | 1966 | 27,354,180 | 1965 | 27,171,172 | 1964 | 26,775,809 | 1963 | 25,647,006 | 1962 | 24,184,806 | 1961 | 22,952,263 | 1960 | 21,974,344 |
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