Year | Value | 2014 | 53,832.479091959 | 2013 | 54,799.174707503 | 2012 | 53,202.833659686 | 2011 | 52,373.877008533 | 2010 | 51,439.908691018 | 2009 | 51,259.187626963 | 2008 | 50,063.954330937 | 2007 | 36,852.544886156 | 2006 | 31,328.386803695 | 2005 | 27,988.029683151 | 2004 | 28,215.452248403 | 2003 | 27,666.386894215 | 2002 | 27,896.898682888 | 2001 | 26,950.394430252 | 2000 | 26,201.525577426 | 1999 | 24,522.227549832 | 1998 | 21,321.160238937 | 1997 | 18,957.835413532 | 1996 | 17,358.580374541 | 1995 | 17,396.473596842 | 1994 | 17,066.321831735 | 1993 | 16,737.131481657 | 1992 | 16,099.932198715 | 1991 | 15,931.139617606 | 1990 | 16,148.273724031 | 1989 | 16,424.627845538 | 1988 | 16,353.007127413 | 1987 | 15,268.914296406 | 1986 | 15,350.768977712 | 1985 | 14,771.856423852 | 1984 | 15,239.383577372 | 1983 | 14,642.771239403 | 1982 | 14,038.31352091 | 1981 | 12,918.463305237 | 1980 | 12,680.921196819 | 1979 | 11,841.318360024 | 1978 | 10,986.995441471 | 1977 | 10,631.247210312 | 1976 | 10,002.089446478 | 1975 | 9,588.0795856482 | 1974 | 9,962.4086353266 | 1973 | 9,895.5806647607 | 1972 | 7,650.4874794991 | 1971 | 7,001.5235470504 | 1970 | 6,471.3996419452 | 1969 | 3,796.0554460119 | 1968 | 2,992.734058604 | 1967 | 2,918.2243108211 | 1966 | 2,914.5574474613 | 1965 | 2,974.7355501701 | 1964 | 3,074.3506029643 | 1963 | 2,978.6752705316 | 1962 | 2,895.0860301133 | 1961 | 2,871.0432388049 | 1960 | 2,614.2822969232 |
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