| Year | Value | | 2021 | 503,380 | | 2020 | 503,380 | | 2019 | 503,380 | | 2018 | 503,380 | | 2017 | 503,380 | | 2016 | 503,380 | | 2015 | 502,370 | | 2014 | 502,360 | | 2013 | 500,360 | | 2012 | 496,850 | | 2011 | 493,350 | | 2010 | 492,350 | | 2009 | 490,350 | | 2008 | 489,310 | | 2007 | 489,310 | | 2006 | 489,300 | | 2005 | 489,300 | | 2004 | 488,300 | | 2003 | 488,300 | | 2002 | 487,300 | | 2001 | 487,300 | | 2000 | 486,300 | | 1999 | 486,300 | | 1998 | 486,300 | | 1997 | 486,300 | | 1996 | 484,300 | | 1995 | 484,500 | | 1994 | 484,200 | | 1993 | 484,000 | | 1992 | 483,700 | | 1991 | 483,500 | | 1990 | 483,000 | | 1989 | 482,500 | | 1988 | 482,300 | | 1987 | 482,050 | | 1986 | 482,050 | | 1985 | 481,550 | | 1984 | 481,500 | | 1983 | 481,500 | | 1982 | 481,500 | | 1981 | 481,500 | | 1980 | 481,500 | | 1979 | 481,500 | | 1978 | 481,500 | | 1977 | 481,000 | | 1976 | 481,000 | | 1975 | 480,000 | | 1974 | 479,200 | | 1973 | 479,100 | | 1972 | 479,000 | | 1971 | 479,000 | | 1970 | 479,000 | | 1969 | 479,000 | | 1968 | 479,000 | | 1967 | 479,000 | | 1966 | 479,000 | | 1965 | 479,000 | | 1964 | 479,000 | | 1963 | 479,000 | | 1962 | 479,000 | | 1961 | 479,000 |
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