Year | Value | 2022 | 24,361,595 | 2021 | 24,178,936 | 2020 | 24,152,012 | 2019 | 24,030,201 | 2018 | 23,851,736 | 2017 | 23,734,338 | 2016 | 23,662,382 | 2015 | 23,626,850 | 2014 | 23,627,558 | 2013 | 23,671,269 | 2012 | 23,713,604 | 2011 | 23,668,076 | 2010 | 23,562,691 | 2009 | 23,435,819 | 2008 | 23,224,481 | 2007 | 22,879,460 | 2006 | 22,487,488 | 2005 | 22,136,732 | 2004 | 21,804,175 | 2003 | 21,467,183 | 2002 | 21,116,299 | 2001 | 20,839,665 | 2000 | 20,696,897 | 1999 | 20,606,430 | 1998 | 20,524,534 | 1997 | 20,441,310 | 1996 | 20,356,531 | 1995 | 20,272,334 | 1994 | 20,184,093 | 1993 | 20,090,193 | 1992 | 19,988,269 | 1991 | 19,891,586 | 1990 | 19,835,238 | 1989 | 19,804,389 | 1988 | 19,764,941 | 1987 | 19,716,629 | 1986 | 19,660,975 | 1985 | 19,598,570 | 1984 | 19,524,836 | 1983 | 19,442,700 | 1982 | 19,348,408 | 1981 | 19,234,286 | 1980 | 19,101,208 | 1979 | 18,952,840 | 1978 | 18,792,700 | 1977 | 18,620,070 | 1976 | 18,436,962 | 1975 | 18,251,470 | 1974 | 18,074,553 | 1973 | 17,897,180 | 1972 | 17,708,913 | 1971 | 17,521,381 | 1970 | 17,318,928 | 1969 | 17,134,432 | 1968 | 16,971,787 | 1967 | 16,757,214 | 1966 | 16,558,365 | 1965 | 16,396,787 | 1964 | 16,226,901 | 1963 | 16,073,495 | 1962 | 15,940,760 | 1961 | 15,802,324 | 1960 | 15,665,693 |
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