Year | Value | 2022 | 23,345,532 | 2021 | 23,130,548 | 2020 | 22,911,069 | 2019 | 22,689,693 | 2018 | 22,467,488 | 2017 | 22,244,116 | 2016 | 22,019,065 | 2015 | 21,791,541 | 2014 | 21,562,981 | 2013 | 21,332,490 | 2012 | 21,099,001 | 2011 | 20,865,767 | 2010 | 20,633,966 | 2009 | 20,588,982 | 2008 | 20,387,718 | 2007 | 20,190,731 | 2006 | 19,992,747 | 2005 | 19,791,355 | 2004 | 19,591,796 | 2003 | 19,398,462 | 2002 | 19,201,347 | 2001 | 18,996,369 | 2000 | 18,790,028 | 1999 | 18,580,528 | 1998 | 18,370,060 | 1997 | 18,160,104 | 1996 | 17,946,204 | 1995 | 17,725,502 | 1994 | 17,499,129 | 1993 | 17,269,492 | 1992 | 17,039,077 | 1991 | 16,807,594 | 1990 | 16,574,141 | 1989 | 16,338,719 | 1988 | 16,100,939 | 1987 | 15,862,727 | 1986 | 15,626,548 | 1985 | 15,392,805 | 1984 | 15,159,735 | 1983 | 14,924,486 | 1982 | 14,688,513 | 1981 | 14,453,114 | 1980 | 14,220,750 | 1979 | 13,991,784 | 1978 | 13,764,006 | 1977 | 13,538,001 | 1976 | 13,315,154 | 1975 | 13,096,382 | 1974 | 12,869,638 | 1973 | 12,639,130 | 1972 | 12,419,477 | 1971 | 12,208,669 | 1970 | 12,005,045 | 1969 | 11,808,657 | 1968 | 11,617,792 | 1967 | 11,429,390 | 1966 | 11,243,003 | 1965 | 11,058,981 | 1964 | 10,876,693 | 1963 | 10,694,826 | 1962 | 10,513,699 | 1961 | 10,335,069 | 1960 | 10,158,262 |
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