Year | Value | 2021 | 256,906 | 2020 | 256,825 | 2019 | 255,553 | 2018 | 255,203 | 2017 | 255,332 | 2016 | 255,457 | 2015 | 255,480 | 2014 | 255,420 | 2013 | 250,600 | 2012 | 252,360 | 2011 | 254,170 | 2010 | 255,980 | 2009 | 257,790 | 2008 | 259,600 | 2007 | 261,410 | 2006 | 263,220 | 2005 | 265,030 | 2004 | 266,840 | 2003 | 268,650 | 2002 | 270,460 | 2001 | 273,250 | 2000 | 273,280 | 1999 | 273,310 | 1998 | 273,340 | 1997 | 276,370 | 1996 | 276,400 | 1995 | 276,430 | 1994 | 276,400 | 1993 | 276,470 | 1992 | 277,240 | 1991 | 277,240 | 1990 | 277,240 | 1989 | 277,240 | 1988 | 277,240 | 1987 | 277,240 | 1986 | 277,240 | 1985 | 277,240 | 1984 | 277,240 | 1983 | 277,240 | 1982 | 277,240 | 1981 | 277,240 | 1980 | 277,240 | 1979 | 277,240 | 1978 | 277,240 | 1977 | 277,240 | 1976 | 277,240 | 1975 | 277,240 | 1974 | 277,240 | 1973 | 277,240 | 1972 | 277,240 | 1971 | 277,240 | 1970 | 277,240 | 1969 | 277,240 | 1968 | 277,240 | 1967 | 277,240 | 1966 | 277,240 | 1965 | 277,240 | 1964 | 277,240 | 1963 | 277,240 | 1962 | 277,240 | 1961 | 277,240 |
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