Year | Value | 2022 | 15,440,719 | 2021 | 15,924,892 | 2020 | 16,307,693 | 2019 | 16,674,566 | 2018 | 16,931,287 | 2017 | 17,077,365 | 2016 | 17,068,331 | 2015 | 16,885,481 | 2014 | 16,663,969 | 2013 | 16,463,931 | 2012 | 16,208,666 | 2011 | 15,878,662 | 2010 | 15,531,348 | 2009 | 15,151,467 | 2008 | 14,729,185 | 2007 | 14,374,451 | 2006 | 14,162,636 | 2005 | 14,034,159 | 2004 | 13,943,648 | 2003 | 13,901,192 | 2002 | 14,004,173 | 2001 | 14,263,385 | 2000 | 14,599,094 | 1999 | 14,992,034 | 1998 | 15,414,680 | 1997 | 15,854,053 | 1996 | 16,348,821 | 1995 | 16,909,532 | 1994 | 17,545,908 | 1993 | 18,226,723 | 1992 | 18,930,937 | 1991 | 19,563,795 | 1990 | 20,002,320 | 1989 | 20,279,354 | 1988 | 20,433,642 | 1987 | 20,395,255 | 1986 | 20,180,681 | 1985 | 19,939,320 | 1984 | 19,691,194 | 1983 | 19,384,574 | 1982 | 19,100,102 | 1981 | 18,912,257 | 1980 | 18,754,855 | 1979 | 18,587,914 | 1978 | 18,443,253 | 1977 | 18,289,943 | 1976 | 18,058,684 | 1975 | 17,775,882 | 1974 | 17,482,304 | 1973 | 17,261,160 | 1972 | 17,077,451 | 1971 | 16,881,817 | 1970 | 16,768,496 | 1969 | 16,819,934 | 1968 | 16,990,170 | 1967 | 17,226,703 | 1966 | 17,567,595 | 1965 | 18,035,107 | 1964 | 18,501,399 | 1963 | 18,780,612 | 1962 | 18,910,933 | 1961 | 18,915,836 | 1960 | 18,826,777 |
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