| Year | Value | | 2014 | 2,058.2310076795 | | 2013 | 2,021.6748559285 | | 2012 | 2,001.3744424865 | | 2011 | 1,955.8488602034 | | 2010 | 1,870.0450347746 | | 2009 | 1,777.9312702964 | | 2008 | 1,796.2389883978 | | 2007 | 1,743.5760106991 | | 2006 | 1,682.8567239552 | | 2005 | 1,642.3162713419 | | 2004 | 1,591.1025058488 | | 2003 | 1,565.9130463582 | | 2002 | 1,486.1166354183 | | 2001 | 1,462.5089961368 | | 2000 | 1,505.7466116449 | | 1999 | 1,447.4393189954 | | 1998 | 1,423.6318226806 | | 1997 | 1,361.6273424999 | | 1996 | 1,299.8008997064 | | 1995 | 1,261.7582506938 | | 1994 | 1,220.5332664202 | | 1993 | 1,177.0845931479 | | 1992 | 1,146.4075498275 | | 1991 | 1,140.6658316487 | | 1990 | 1,107.0580461944 | | 1989 | 1,107.9161722579 | | 1988 | 1,091.6065007603 | | 1987 | 1,061.8367737978 | | 1986 | 1,036.7783304178 | | 1985 | 993.64863861754 | | 1984 | 957.96740215465 | | 1983 | 899.57319007103 | | 1982 | 869.98625914293 | | 1981 | 841.28503578825 | | 1980 | 829.61500788682 | | 1979 | 785.08802649742 | | 1978 | 727.21445731637 | | 1977 | 680.5637751695 | | 1976 | 632.32818659884 | | 1975 | 590.62665721951 | | 1974 | 565.43763104291 | | 1973 | 529.38374046354 | | 1972 | 492.24007882131 | | 1971 | 461.9930040566 |
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