| Year | Value | | 2018 | 6,913,104 | | 2017 | 6,864,030 | | 2016 | 6,820,410 | | 2015 | 6,772,503 | | 2014 | 6,713,950 | | 2013 | 6,651,753 | | 2012 | 6,579,687 | | 2011 | 6,488,936 | | 2010 | 6,373,749 | | 2009 | 6,231,743 | | 2008 | 6,062,945 | | 2007 | 5,877,473 | | 2006 | 5,691,253 | | 2005 | 5,514,447 | | 2004 | 5,347,100 | | 2003 | 5,190,094 | | 2002 | 5,039,270 | | 2001 | 4,886,878 | | 2000 | 4,728,655 | | 1999 | 4,558,375 | | 1998 | 4,383,826 | | 1997 | 4,207,449 | | 1996 | 4,033,207 | | 1995 | 3,864,134 | | 1994 | 3,693,188 | | 1993 | 3,525,341 | | 1992 | 3,367,752 | | 1991 | 3,230,525 | | 1990 | 3,119,281 | | 1989 | 3,036,086 | | 1988 | 2,983,330 | | 1987 | 2,947,724 | | 1986 | 2,907,629 | | 1985 | 2,849,647 | | 1984 | 2,768,277 | | 1983 | 2,664,809 | | 1982 | 2,551,672 | | 1981 | 2,451,043 | | 1980 | 2,377,088 | | 1979 | 2,320,059 | | 1978 | 2,287,534 | | 1977 | 2,268,664 | | 1976 | 2,244,341 | | 1975 | 2,202,209 | | 1974 | 2,142,501 | | 1973 | 2,067,017 | | 1972 | 1,982,059 | | 1971 | 1,898,618 | | 1970 | 1,823,928 | | 1969 | 1,754,918 | | 1968 | 1,692,445 | | 1967 | 1,637,353 | | 1966 | 1,590,477 | | 1965 | 1,552,386 | | 1964 | 1,516,891 | | 1963 | 1,490,355 | | 1962 | 1,469,514 | | 1961 | 1,448,869 | | 1960 | 1,424,798 |
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