Year | Value | 2022 | 20,815,408 | 2021 | 20,371,170 | 2020 | 19,808,577 | 2019 | 19,264,738 | 2018 | 18,755,532 | 2017 | 18,261,903 | 2016 | 17,771,152 | 2015 | 17,301,782 | 2014 | 16,869,016 | 2013 | 16,470,618 | 2012 | 16,096,245 | 2011 | 15,742,808 | 2010 | 15,404,477 | 2009 | 15,067,755 | 2008 | 14,712,547 | 2007 | 14,339,229 | 2006 | 13,975,603 | 2005 | 13,614,617 | 2004 | 13,265,203 | 2003 | 12,936,234 | 2002 | 12,616,027 | 2001 | 12,312,370 | 2000 | 12,023,771 | 1999 | 11,723,028 | 1998 | 11,390,621 | 1997 | 11,046,838 | 1996 | 10,712,591 | 1995 | 10,339,514 | 1994 | 9,917,400 | 1993 | 9,534,143 | 1992 | 9,232,610 | 1991 | 9,046,265 | 1990 | 8,995,290 | 1989 | 8,987,198 | 1988 | 9,055,604 | 1987 | 9,153,435 | 1986 | 9,144,868 | 1985 | 9,010,135 | 1984 | 8,767,131 | 1983 | 8,427,871 | 1982 | 8,088,205 | 1981 | 7,835,106 | 1980 | 7,717,713 | 1979 | 7,703,073 | 1978 | 7,752,412 | 1977 | 7,797,623 | 1976 | 7,787,004 | 1975 | 7,717,243 | 1974 | 7,601,165 | 1973 | 7,462,775 | 1972 | 7,297,073 | 1971 | 7,101,428 | 1970 | 6,838,074 | 1969 | 6,563,759 | 1968 | 6,349,669 | 1967 | 6,128,112 | 1966 | 5,912,736 | 1965 | 5,771,283 | 1964 | 5,720,810 | 1963 | 5,701,853 | 1962 | 5,730,965 | 1961 | 5,780,785 | 1960 | 5,793,785 |
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