Year | Value | 2022 | 37,657,829 | 2021 | 37,884,389 | 2020 | 38,066,482 | 2019 | 37,800,256 | 2018 | 37,413,729 | 2017 | 36,965,332 | 2016 | 36,468,049 | 2015 | 35,879,614 | 2014 | 35,282,316 | 2013 | 34,686,577 | 2012 | 34,108,923 | 2011 | 33,750,793 | 2010 | 33,453,389 | 2009 | 33,071,668 | 2008 | 32,975,951 | 2007 | 33,006,646 | 2006 | 32,625,547 | 2005 | 31,624,523 | 2004 | 30,415,658 | 2003 | 29,194,963 | 2002 | 27,941,053 | 2001 | 26,895,572 | 2000 | 26,620,860 | 1999 | 26,658,986 | 1998 | 26,440,716 | 1997 | 26,220,519 | 1996 | 26,086,269 | 1995 | 25,807,065 | 1994 | 25,378,844 | 1993 | 24,978,951 | 1992 | 24,608,686 | 1991 | 24,314,902 | 1990 | 24,230,245 | 1989 | 24,419,433 | 1988 | 24,619,582 | 1987 | 24,704,433 | 1986 | 24,629,567 | 1985 | 24,254,796 | 1984 | 23,623,810 | 1983 | 23,093,662 | 1982 | 22,639,895 | 1981 | 22,127,277 | 1980 | 21,792,517 | 1979 | 21,409,563 | 1978 | 20,470,820 | 1977 | 19,276,732 | 1976 | 18,288,631 | 1975 | 17,479,769 | 1974 | 17,174,516 | 1973 | 17,598,479 | 1972 | 18,395,047 | 1971 | 19,158,342 | 1970 | 19,673,628 | 1969 | 19,926,796 | 1968 | 19,954,414 | 1967 | 19,883,682 | 1966 | 19,708,520 | 1965 | 19,489,427 | 1964 | 19,238,465 | 1963 | 18,898,063 | 1962 | 18,584,561 | 1961 | 18,316,633 | 1960 | 18,008,058 |
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