Year | Value | 2021 | 13,656.7 | 2020 | 13,646.093 | 2019 | 13,564.226 | 2018 | 13,540 | 2017 | 13,270 | 2016 | 13,508 | 2015 | 13,280 | 2014 | 13,313 | 2013 | 13,365 | 2012 | 13,320 | 2011 | 13,357 | 2010 | 13,557 | 2009 | 13,636 | 2008 | 13,653 | 2007 | 13,669 | 2006 | 13,800 | 2005 | 13,830 | 2004 | 13,913 | 2003 | 13,922 | 2002 | 13,891 | 2001 | 13,868 | 2000 | 13,896 | 1999 | 15,210 | 1998 | 15,180 | 1997 | 15,100 | 1996 | 15,010 | 1995 | 14,950 | 1994 | 14,920 | 1993 | 14,830 | 1992 | 14,710 | 1991 | 14,230 | 1990 | 14,430 | 1989 | 14,660 | 1988 | 14,960 | 1987 | 15,010 | 1986 | 15,100 | 1985 | 15,160 | 1984 | 15,240 | 1983 | 15,280 | 1982 | 15,310 | 1981 | 14,600 | 1980 | 14,710 | 1979 | 16,890 | 1978 | 17,760 | 1977 | 17,680 | 1976 | 17,810 | 1975 | 17,910 | 1974 | 18,010 | 1973 | 17,630 | 1972 | 17,480 | 1971 | 17,560 | 1970 | 17,630 | 1969 | 17,630 | 1968 | 17,520 | 1967 | 17,580 | 1966 | 17,550 | 1965 | 17,580 | 1964 | 17,610 | 1963 | 17,720 | 1962 | 18,160 | 1961 | 18,110 |
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