Year | Value | 2021 | 277,100 | 2020 | 277,100 | 2019 | 277,100 | 2018 | 276,990 | 2017 | 276,880 | 2016 | 276,770 | 2015 | 276,660 | 2014 | 276,540 | 2013 | 276,430 | 2012 | 276,320 | 2011 | 276,210 | 2010 | 273,100 | 2009 | 272,850 | 2008 | 270,850 | 2007 | 270,700 | 2006 | 270,540 | 2005 | 270,020 | 2004 | 269,920 | 2003 | 268,740 | 2002 | 268,180 | 2001 | 268,390 | 2000 | 266,710 | 1999 | 268,760 | 1998 | 264,580 | 1997 | 265,940 | 1996 | 264,510 | 1995 | 272,180 | 1994 | 272,320 | 1993 | 268,400 | 1992 | 270,720 | 1991 | 268,770 | 1990 | 267,700 | 1989 | 270,530 | 1988 | 266,620 | 1987 | 264,350 | 1986 | 263,730 | 1985 | 263,540 | 1984 | 255,050 | 1983 | 255,800 | 1982 | 255,800 | 1981 | 255,800 | 1980 | 255,800 | 1979 | 255,800 | 1978 | 255,800 | 1977 | 255,800 | 1976 | 255,780 | 1975 | 255,720 | 1974 | 252,650 | 1973 | 252,600 | 1972 | 252,550 | 1971 | 252,500 | 1970 | 252,450 | 1969 | 252,400 | 1968 | 252,350 | 1967 | 252,300 | 1966 | 252,250 | 1965 | 252,200 | 1964 | 252,150 | 1963 | 252,100 | 1962 | 252,050 | 1961 | 252,000 |
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