Year | Value | 2022 | 20,797,661 | 2021 | 21,037,345 | 2020 | 21,315,304 | 2019 | 21,615,501 | 2018 | 21,829,457 | 2017 | 21,906,671 | 2016 | 21,856,653 | 2015 | 21,620,845 | 2014 | 21,171,598 | 2013 | 20,598,147 | 2012 | 20,002,403 | 2011 | 19,435,081 | 2010 | 18,892,409 | 2009 | 18,386,111 | 2008 | 17,914,145 | 2007 | 17,495,530 | 2006 | 17,166,652 | 2005 | 16,877,188 | 2004 | 16,607,963 | 2003 | 16,392,530 | 2002 | 16,245,978 | 2001 | 16,150,708 | 2000 | 16,118,910 | 1999 | 16,185,069 | 1998 | 16,354,339 | 1997 | 16,620,882 | 1996 | 16,941,799 | 1995 | 17,217,157 | 1994 | 17,406,312 | 1993 | 17,528,096 | 1992 | 17,595,780 | 1991 | 17,636,976 | 1990 | 17,666,392 | 1989 | 17,648,640 | 1988 | 17,544,370 | 1987 | 17,351,480 | 1986 | 17,045,083 | 1985 | 16,652,746 | 1984 | 16,210,406 | 1983 | 15,710,503 | 1982 | 15,181,297 | 1981 | 14,655,127 | 1980 | 14,146,164 | 1979 | 13,661,511 | 1978 | 13,239,248 | 1977 | 12,865,713 | 1976 | 12,463,839 | 1975 | 12,066,890 | 1974 | 11,751,636 | 1973 | 11,499,019 | 1972 | 11,258,632 | 1971 | 11,014,527 | 1970 | 10,765,930 | 1969 | 10,520,878 | 1968 | 10,286,086 | 1967 | 10,058,416 | 1966 | 9,821,421 | 1965 | 9,573,045 | 1964 | 9,321,488 | 1963 | 9,064,162 | 1962 | 8,807,194 | 1961 | 8,581,529 | 1960 | 8,386,852 |
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