Year | Value | 2014 | 2,398.4136735937 | 2013 | 2,336.4643431291 | 2012 | 2,233.6420616785 | 2011 | 2,158.4527132384 | 2010 | 2,012.8005050432 | 2009 | 1,852.7156362061 | 2008 | 1,811.907070422 | 2007 | 1,755.6439580897 | 2006 | 1,633.1765485265 | 2005 | 1,511.1848866057 | 2004 | 1,427.6516961335 | 2003 | 1,335.5530282009 | 2002 | 1,246.0608758743 | 2001 | 1,193.2343837422 | 2000 | 1,167.1867538071 | 1999 | 1,117.9238319803 | 1998 | 1,097.2653851951 | 1997 | 1,088.9260454985 | 1996 | 1,068.3499677824 | 1995 | 1,041.4466070767 | 1994 | 1,018.6649939391 | 1993 | 1,016.2500786265 | 1992 | 1,018.3243649542 | 1991 | 1,028.9140988053 | 1990 | 1,027.1135476756 | 1989 | 629.69759221099 | 1988 | 609.98552616701 | 1987 | 581.39015877216 | 1986 | 555.79542883073 | 1985 | 528.23030515202 | 1984 | 505.76532829846 | 1983 | 476.59818996155 | 1982 | 455.77335992287 | 1981 | 441.07030819989 | 1980 | 432.90363967053 | 1979 | 411.5159750922 | 1978 | 387.68595776998 | 1977 | 361.25062646084 | 1976 | 340.07693129376 | 1975 | 320.81728229257 | 1974 | 296.76622145204 | 1973 | 285.66072583738 | 1972 | 268.05239457315 | 1971 | 250.97035919676 |
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