Year | Value | 2021 | 49,100 | 2020 | 49,090 | 2019 | 49,090 | 2018 | 49,090 | 2017 | 49,070 | 2016 | 49,070 | 2015 | 49,070 | 2014 | 49,070 | 2013 | 48,860 | 2012 | 48,800 | 2011 | 48,750 | 2010 | 49,070 | 2009 | 49,360 | 2008 | 49,400 | 2007 | 49,400 | 2006 | 49,400 | 2005 | 49,450 | 2004 | 49,450 | 2003 | 49,450 | 2002 | 49,520 | 2001 | 49,520 | 2000 | 49,520 | 1999 | 49,500 | 1998 | 49,500 | 1997 | 49,500 | 1996 | 49,500 | 1995 | 49,500 | 1994 | 49,600 | 1993 | 49,600 | 1992 | 49,600 | 1991 | 49,580 | 1990 | 49,560 | 1989 | 49,560 | 1988 | 49,560 | 1987 | 49,550 | 1986 | 49,540 | 1985 | 49,530 | 1984 | 49,520 | 1983 | 49,500 | 1982 | 49,500 | 1981 | 49,450 | 1980 | 49,450 | 1979 | 49,300 | 1978 | 49,200 | 1977 | 49,100 | 1976 | 49,000 | 1975 | 48,900 | 1974 | 48,700 | 1973 | 48,600 | 1972 | 48,500 | 1971 | 48,400 | 1970 | 48,300 | 1969 | 48,200 | 1968 | 48,100 | 1967 | 48,000 | 1966 | 47,900 | 1965 | 47,800 | 1964 | 47,700 | 1963 | 47,560 | 1962 | 47,480 | 1961 | 47,380 |
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