Year | Value | 2021 | 25,974.594 | 2020 | 26,026.654 | 2019 | 26,512.1 | 2018 | 26,528.3 | 2017 | 26,546.2 | 2016 | 26,701.7 | 2015 | 27,184.5 | 2014 | 27,142 | 2013 | 27,164 | 2012 | 27,352 | 2011 | 27,573 | 2010 | 27,792 | 2009 | 27,950 | 2008 | 28,094 | 2007 | 28,301 | 2006 | 28,433 | 2005 | 28,568 | 2004 | 28,674 | 2003 | 28,852.3 | 2002 | 29,022 | 2001 | 29,161 | 2000 | 29,402 | 1999 | 29,552 | 1998 | 29,599 | 1997 | 29,646 | 1996 | 29,733 | 1995 | 29,811 | 1994 | 29,941 | 1993 | 29,990 | 1992 | 30,130 | 1991 | 30,369 | 1990 | 30,239 | 1989 | 30,506 | 1988 | 30,483 | 1987 | 30,280 | 1986 | 30,268 | 1985 | 30,375 | 1984 | 30,332 | 1983 | 30,259 | 1982 | 31,427 | 1981 | 31,554 | 1980 | 31,410 | 1979 | 31,429 | 1978 | 31,808 | 1977 | 31,776 | 1976 | 31,835 | 1975 | 31,895 | 1974 | 32,073 | 1973 | 32,222 | 1972 | 33,071 | 1971 | 33,209 | 1970 | 33,358 | 1969 | 33,511 | 1968 | 33,593 | 1967 | 33,737 | 1966 | 34,060 | 1965 | 34,642 | 1964 | 34,765 | 1963 | 34,898 | 1962 | 35,310 | 1961 | 35,554 |
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