| Year | Value | | 2018 | 8,508,563 | | 2017 | 8,621,479 | | 2016 | 8,712,638 | | 2015 | 8,775,962 | | 2014 | 8,798,347 | | 2013 | 8,788,428 | | 2012 | 8,761,566 | | 2011 | 8,739,981 | | 2010 | 8,736,084 | | 2009 | 8,741,580 | | 2008 | 8,762,753 | | 2007 | 8,799,225 | | 2006 | 8,845,905 | | 2005 | 8,896,344 | | 2004 | 8,950,099 | | 2003 | 9,012,969 | | 2002 | 9,068,621 | | 2001 | 9,092,407 | | 2000 | 9,069,399 | | 1999 | 8,981,844 | | 1998 | 8,843,169 | | 1997 | 8,668,498 | | 1996 | 8,482,631 | | 1995 | 8,301,974 | | 1994 | 8,112,215 | | 1993 | 7,925,286 | | 1992 | 7,749,821 | | 1991 | 7,593,840 | | 1990 | 7,460,876 | | 1989 | 7,359,141 | | 1988 | 7,286,361 | | 1987 | 7,234,485 | | 1986 | 7,190,604 | | 1985 | 7,145,906 | | 1984 | 7,088,247 | | 1983 | 7,026,305 | | 1982 | 6,953,899 | | 1981 | 6,864,489 | | 1980 | 6,755,620 | | 1979 | 6,610,463 | | 1978 | 6,438,845 | | 1977 | 6,251,504 | | 1976 | 6,065,149 | | 1975 | 5,889,974 | | 1974 | 5,720,365 | | 1973 | 5,564,341 | | 1972 | 5,416,262 | | 1971 | 5,264,521 | | 1970 | 5,101,931 | | 1969 | 4,928,741 | | 1968 | 4,748,339 | | 1967 | 4,564,517 | | 1966 | 4,384,752 | | 1965 | 4,214,978 | | 1964 | 4,036,468 | | 1963 | 3,860,807 | | 1962 | 3,696,451 | | 1961 | 3,556,282 | | 1960 | 3,448,044 |
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