Year | Value | 2021 | 470,670 | 2020 | 470,276.667 | 2019 | 469,883.333 | 2018 | 469,150 | 2017 | 464,350 | 2016 | 459,540 | 2015 | 459,540 | 2014 | 459,540 | 2013 | 459,540 | 2012 | 462,458 | 2011 | 463,926 | 2010 | 465,394 | 2009 | 466,862 | 2008 | 466,850 | 2007 | 480,730 | 2006 | 478,520 | 2005 | 476,310 | 2004 | 644,860 | 2003 | 642,650 | 2002 | 640,440 | 2001 | 638,230 | 2000 | 628,840 | 1999 | 636,870 | 1998 | 647,870 | 1997 | 638,320 | 1996 | 644,270 | 1995 | 642,080 | 1994 | 641,570 | 1993 | 641,520 | 1992 | 637,870 | 1991 | 629,970 | 1990 | 615,000 | 1989 | 617,000 | 1988 | 618,710 | 1987 | 610,300 | 1986 | 607,000 | 1985 | 603,700 | 1984 | 595,400 | 1983 | 592,100 | 1982 | 588,670 | 1981 | 582,800 | 1980 | 577,130 | 1979 | 599,080 | 1978 | 588,670 | 1977 | 596,930 | 1976 | 599,500 | 1975 | 604,400 | 1974 | 609,600 | 1973 | 614,810 | 1972 | 608,000 | 1971 | 601,540 | 1970 | 597,000 | 1969 | 596,700 | 1968 | 596,000 | 1967 | 595,500 | 1966 | 594,800 | 1965 | 594,700 | 1964 | 594,100 | 1963 | 593,500 | 1962 | 592,900 | 1961 | 592,710 |
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