Year | Value | 2021 | 26,180 | 2020 | 26,199.87 | 2019 | 26,259.65 | 2018 | 26,325 | 2017 | 26,313 | 2016 | 26,251 | 2015 | 26,338.99 | 2014 | 26,526.31 | 2013 | 26,280 | 2012 | 26,240 | 2011 | 26,900 | 2010 | 26,260 | 2009 | 26,340 | 2008 | 26,680 | 2007 | 26,630 | 2006 | 27,100 | 2005 | 27,070 | 2004 | 26,460 | 2003 | 26,580 | 2002 | 26,650 | 2001 | 26,760 | 2000 | 26,470 | 1999 | 26,440 | 1998 | 26,720 | 1997 | 26,880 | 1996 | 27,160 | 1995 | 27,260 | 1994 | 26,910 | 1993 | 27,390 | 1992 | 27,560 | 1991 | 27,700 | 1990 | 27,880 | 1989 | 27,740 | 1988 | 27,870 | 1987 | 27,980 | 1986 | 28,190 | 1985 | 28,340 | 1984 | 28,550 | 1983 | 28,460 | 1982 | 28,870 | 1981 | 28,970 | 1980 | 29,050 | 1979 | 29,200 | 1978 | 29,210 | 1977 | 29,270 | 1976 | 29,330 | 1975 | 29,370 | 1974 | 29,320 | 1973 | 29,860 | 1972 | 29,560 | 1971 | 29,510 | 1970 | 29,750 | 1969 | 29,910 | 1968 | 30,170 | 1967 | 30,230 | 1966 | 30,270 | 1965 | 30,330 | 1964 | 30,680 | 1963 | 30,880 | 1962 | 31,410 | 1961 | 31,600 |
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