| Year | Value | | 2018 | 8,711,462 | | 2017 | 8,774,226 | | 2016 | 8,801,846 | | 2015 | 8,779,040 | | 2014 | 8,705,502 | | 2013 | 8,580,838 | | 2012 | 8,418,727 | | 2011 | 8,241,593 | | 2010 | 8,064,613 | | 2009 | 7,889,848 | | 2008 | 7,714,192 | | 2007 | 7,546,618 | | 2006 | 7,397,427 | | 2005 | 7,272,560 | | 2004 | 7,179,135 | | 2003 | 7,113,136 | | 2002 | 7,066,025 | | 2001 | 7,024,394 | | 2000 | 6,979,513 | | 1999 | 6,924,384 | | 1998 | 6,864,644 | | 1997 | 6,793,891 | | 1996 | 6,704,141 | | 1995 | 6,590,716 | | 1994 | 6,448,494 | | 1993 | 6,280,060 | | 1992 | 6,094,999 | | 1991 | 5,907,496 | | 1990 | 5,726,108 | | 1989 | 5,559,628 | | 1988 | 5,402,806 | | 1987 | 5,251,299 | | 1986 | 5,097,276 | | 1985 | 4,936,463 | | 1984 | 4,765,068 | | 1983 | 4,587,961 | | 1982 | 4,407,709 | | 1981 | 4,229,166 | | 1980 | 4,056,830 | | 1979 | 3,882,329 | | 1978 | 3,710,027 | | 1977 | 3,548,126 | | 1976 | 3,408,527 | | 1975 | 3,297,773 | | 1974 | 3,215,560 | | 1973 | 3,166,581 | | 1972 | 3,135,747 | | 1971 | 3,097,795 | | 1970 | 3,036,836 | | 1969 | 2,955,704 | | 1968 | 2,849,836 | | 1967 | 2,733,261 | | 1966 | 2,630,845 | | 1965 | 2,558,052 | | 1964 | 2,503,147 | | 1963 | 2,474,461 | | 1962 | 2,459,929 | | 1961 | 2,438,675 | | 1960 | 2,397,585 |
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