Year | Value | 2022 | 31,177,647 | 2021 | 31,255,485 | 2020 | 31,249,168 | 2019 | 31,357,343 | 2018 | 31,508,234 | 2017 | 31,641,948 | 2016 | 31,842,872 | 2015 | 32,046,938 | 2014 | 32,117,876 | 2013 | 32,002,382 | 2012 | 31,816,268 | 2011 | 31,566,024 | 2010 | 31,237,059 | 2009 | 30,862,482 | 2008 | 30,497,539 | 2007 | 30,068,190 | 2006 | 29,628,469 | 2005 | 29,220,996 | 2004 | 28,869,618 | 2003 | 28,487,773 | 2002 | 28,024,716 | 2001 | 27,439,713 | 2000 | 26,294,859 | 1999 | 24,666,661 | 1998 | 23,116,801 | 1997 | 21,857,335 | 1996 | 21,212,869 | 1995 | 21,613,604 | 1994 | 22,734,277 | 1993 | 24,006,069 | 1992 | 25,203,981 | 1991 | 25,853,560 | 1990 | 25,828,937 | 1989 | 25,321,866 | 1988 | 24,485,615 | 1987 | 23,765,658 | 1986 | 23,364,433 | 1985 | 23,375,495 | 1984 | 23,787,719 | 1983 | 24,453,302 | 1982 | 25,025,238 | 1981 | 25,367,721 | 1980 | 25,488,585 | 1979 | 25,374,247 | 1978 | 25,124,571 | 1977 | 24,762,796 | 1976 | 24,277,859 | 1975 | 23,643,248 | 1974 | 22,706,280 | 1973 | 21,336,613 | 1972 | 19,712,617 | 1971 | 18,225,507 | 1970 | 17,296,693 | 1969 | 17,433,245 | 1968 | 18,447,094 | 1967 | 19,881,541 | 1966 | 21,337,623 | 1965 | 22,341,282 | 1964 | 22,643,885 | 1963 | 22,477,868 | 1962 | 22,168,004 | 1961 | 21,840,278 | 1960 | 21,460,549 |
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