Year | Value | 2022 | 18,424,259 | 2021 | 18,224,167 | 2020 | 18,193,984 | 2019 | 18,216,691 | 2018 | 18,223,831 | 2017 | 18,320,777 | 2016 | 18,505,155 | 2015 | 18,764,877 | 2014 | 19,062,430 | 2013 | 19,306,071 | 2012 | 19,469,673 | 2011 | 19,604,992 | 2010 | 19,668,697 | 2009 | 19,581,794 | 2008 | 19,362,868 | 2007 | 18,994,308 | 2006 | 18,477,232 | 2005 | 17,910,915 | 2004 | 17,372,413 | 2003 | 16,842,775 | 2002 | 16,323,384 | 2001 | 15,787,722 | 2000 | 15,196,011 | 1999 | 14,598,907 | 1998 | 14,033,169 | 1997 | 13,513,289 | 1996 | 13,055,392 | 1995 | 12,668,878 | 1994 | 12,325,410 | 1993 | 12,062,774 | 1992 | 11,825,712 | 1991 | 11,518,849 | 1990 | 11,159,215 | 1989 | 10,733,372 | 1988 | 10,437,919 | 1987 | 10,150,614 | 1986 | 9,846,569 | 1985 | 9,527,258 | 1984 | 9,208,093 | 1983 | 8,883,774 | 1982 | 8,559,779 | 1981 | 8,224,469 | 1980 | 7,920,663 | 1979 | 7,672,160 | 1978 | 7,457,700 | 1977 | 7,253,464 | 1976 | 7,008,983 | 1975 | 6,752,899 | 1974 | 6,507,023 | 1973 | 6,249,154 | 1972 | 5,988,896 | 1971 | 5,744,496 | 1970 | 5,502,818 | 1969 | 5,254,342 | 1968 | 5,017,140 | 1967 | 4,802,040 | 1966 | 4,604,501 | 1965 | 4,442,922 | 1964 | 4,320,305 | 1963 | 4,234,934 | 1962 | 4,181,750 | 1961 | 4,146,355 | 1960 | 4,120,699 |
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