| Year | Value | | 2014 | 13,914.678448876 | | 2013 | 14,193.168433451 | | 2012 | 14,703.943527214 | | 2011 | 15,586.084225432 | | 2010 | 16,829.962540906 | | 2009 | 14,425.964727602 | | 2008 | 15,937.787782667 | | 2007 | 16,352.321804693 | | 2006 | 16,456.604116902 | | 2005 | 15,644.146720039 | | 2004 | 16,300.112422096 | | 2003 | 16,258.884485087 | | 2002 | 15,980.276797221 | | 2001 | 15,616.329766151 | | 2000 | 15,668.118267247 | | 1999 | 14,990.417561996 | | 1998 | 15,460.324935248 | | 1997 | 15,134.104184051 | | 1996 | 14,629.730219084 | | 1995 | 14,920.770877944 | | 1994 | 13,665.074145312 | | 1993 | 12,632.241021448 | | 1992 | 12,927.902084529 | | 1991 | 14,087.855297158 | | 1990 | 13,667.670551264 | | 1989 | 13,537.523203394 | | 1988 | 13,423.483732762 | | 1987 | 12,275.118004046 | | 1986 | 12,159.465732785 | | 1985 | 12,064.160390067 | | 1984 | 11,737.769058847 | | 1983 | 11,137.185399128 | | 1982 | 10,992.408180015 | | 1981 | 11,089.054692313 | | 1980 | 10,784.017575175 | | 1979 | 10,982.318054545 | | 1978 | 10,806.420870315 | | 1977 | 10,443.936484041 | | 1976 | 11,487.78452642 | | 1975 | 10,642.15071737 | | 1974 | 13,108.012955922 | | 1973 | 11,796.261948923 | | 1972 | 11,661.858049625 | | 1971 | 11,871.351348194 | | 1970 | 10,649.495387283 | | 1969 | 10,260.740740741 | | 1968 | 9,209.4685127289 | | 1967 | 9,495.6641143898 | | 1966 | 9,541.9218616631 | | 1965 | 9,107.0889894419 | | 1964 | 8,692.6010678871 | | 1963 | 7,016.3529774761 | | 1962 | 5,094.3102104443 | | 1961 | 4,630.0241442977 | | 1960 | 4,548.2052425391 |
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