Year | Value | 2022 | 14,691,252 | 2021 | 15,401,827 | 2020 | 15,985,406 | 2019 | 16,644,586 | 2018 | 17,313,144 | 2017 | 17,960,503 | 2016 | 18,470,629 | 2015 | 18,773,270 | 2014 | 18,896,066 | 2013 | 18,914,348 | 2012 | 18,780,335 | 2011 | 18,492,429 | 2010 | 18,203,082 | 2009 | 17,949,344 | 2008 | 17,658,282 | 2007 | 17,408,861 | 2006 | 17,281,099 | 2005 | 17,134,032 | 2004 | 16,956,159 | 2003 | 16,760,662 | 2002 | 16,570,592 | 2001 | 16,387,639 | 2000 | 16,169,585 | 1999 | 15,946,662 | 1998 | 15,793,858 | 1997 | 15,642,943 | 1996 | 15,438,863 | 1995 | 15,327,239 | 1994 | 15,386,774 | 1993 | 15,549,005 | 1992 | 15,804,600 | 1991 | 16,204,285 | 1990 | 16,654,822 | 1989 | 17,056,192 | 1988 | 17,283,907 | 1987 | 17,354,399 | 1986 | 17,316,792 | 1985 | 17,184,003 | 1984 | 17,044,077 | 1983 | 16,881,236 | 1982 | 16,627,962 | 1981 | 16,329,750 | 1980 | 16,018,589 | 1979 | 15,699,751 | 1978 | 15,296,258 | 1977 | 14,816,914 | 1976 | 14,280,394 | 1975 | 13,354,732 | 1974 | 12,072,245 | 1973 | 10,841,264 | 1972 | 9,931,898 | 1971 | 9,625,133 | 1970 | 10,094,731 | 1969 | 11,175,236 | 1968 | 12,538,305 | 1967 | 13,807,782 | 1966 | 14,502,234 | 1965 | 14,588,686 | 1964 | 14,208,492 | 1963 | 13,486,636 | 1962 | 12,829,366 | 1961 | 12,431,361 | 1960 | 12,439,714 |
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