| Year | Value | | 2014 | 6,474.5002016578 | | 2013 | 6,122.8607061635 | | 2012 | 6,111.3045416324 | | 2011 | 5,934.7588146698 | | 2010 | 5,826.6832389863 | | 2009 | 5,599.5524806518 | | 2008 | 4,971.279066083 | | 2007 | 4,474.0376866101 | | 2006 | 4,245.7986237083 | | 2005 | 3,917.7923593905 | | 2004 | 3,793.2563880827 | | 2003 | 3,483.3031748643 | | 2002 | 3,421.0343480502 | | 2001 | 3,320.4851403552 | | 2000 | 3,097.788506616 | | 1999 | 3,005.7078612817 | | 1998 | 3,026.6781943628 | | 1997 | 2,789.9151580789 | | 1996 | 2,652.5390980281 | | 1995 | 2,618.8950748203 | | 1994 | 2,515.3783964287 | | 1993 | 2,445.6191224538 | | 1992 | 2,243.0684249207 | | 1991 | 2,152.8218587401 | | 1990 | 2,196.1470171635 | | 1989 | 2,017.693620984 | | 1988 | 2,046.2809367556 | | 1987 | 1,948.0210336707 | | 1986 | 1,939.8023895594 | | 1985 | 1,624.9300777587 | | 1984 | 1,394.0089813446 | | 1983 | 1,180.4493676876 | | 1982 | 1,019.0626205195 | | 1981 | 856.24716443664 | | 1980 | 707.64313556673 | | 1979 | 548.08683439369 | | 1978 | 451.38318268967 | | 1977 | 411.0265966536 | | 1976 | 283.95266970116 | | 1975 | 171.49520956715 | | 1974 | 106.00575611256 | | 1973 | 56.27253474829 | | 1972 | 32.483811057207 | | 1971 | 15.969733000582 |
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