Year | Value | 2022 | 17,700,837 | 2021 | 17,309,284 | 2020 | 16,983,165 | 2019 | 16,688,128 | 2018 | 16,424,639 | 2017 | 16,232,175 | 2016 | 16,104,320 | 2015 | 15,997,428 | 2014 | 15,956,722 | 2013 | 16,072,219 | 2012 | 16,316,061 | 2011 | 16,616,874 | 2010 | 16,889,905 | 2009 | 17,085,074 | 2008 | 17,227,773 | 2007 | 17,309,350 | 2006 | 17,337,628 | 2005 | 17,325,517 | 2004 | 17,255,236 | 2003 | 17,104,566 | 2002 | 16,891,001 | 2001 | 16,575,433 | 2000 | 16,149,701 | 1999 | 15,679,740 | 1998 | 15,168,939 | 1997 | 14,612,183 | 1996 | 14,051,051 | 1995 | 13,521,313 | 1994 | 13,017,491 | 1993 | 12,583,931 | 1992 | 12,214,373 | 1991 | 11,858,074 | 1990 | 11,500,029 | 1989 | 11,166,842 | 1988 | 10,883,467 | 1987 | 10,616,389 | 1986 | 10,345,147 | 1985 | 10,073,027 | 1984 | 9,803,118 | 1983 | 9,530,975 | 1982 | 9,265,257 | 1981 | 8,965,276 | 1980 | 8,650,155 | 1979 | 8,364,471 | 1978 | 8,102,168 | 1977 | 7,839,819 | 1976 | 7,574,762 | 1975 | 7,341,283 | 1974 | 7,128,096 | 1973 | 6,924,577 | 1972 | 6,728,634 | 1971 | 6,519,362 | 1970 | 6,292,859 | 1969 | 6,063,895 | 1968 | 5,827,351 | 1967 | 5,587,605 | 1966 | 5,357,483 | 1965 | 5,135,725 | 1964 | 4,910,972 | 1963 | 4,694,594 | 1962 | 4,501,147 | 1961 | 4,329,198 | 1960 | 4,188,407 |
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