Year | Value | 2014 | 949.99199616847 | 2013 | 971.44322286999 | 2012 | 927.07873303784 | 2011 | 891.10135336935 | 2010 | 866.85811691594 | 2009 | 855.33396769235 | 2008 | 864.68595848552 | 2007 | 891.1123865449 | 2006 | 823.10923506356 | 2005 | 757.22732239152 | 2004 | 688.74049295395 | 2003 | 689.91275540502 | 2002 | 661.75644933895 | 2001 | 620.23064096345 | 2000 | 607.70511684016 | 1999 | 580.87204069244 | 1998 | 562.09912417548 | 1997 | 546.67087024731 | 1996 | 506.62913091628 | 1995 | 494.93797618209 | 1994 | 462.67037037167 | 1993 | 426.74579074681 | 1992 | 375.52641238455 | 1991 | 362.74942456332 | 1990 | 345.99181432183 | 1989 | 325.1862848795 | 1988 | 326.27784095744 | 1987 | 319.11114619514 | 1986 | 302.9700723507 | 1985 | 299.99444302843 | 1984 | 291.49647893582 | 1983 | 282.74850309616 | 1982 | 263.04896797846 | 1981 | 266.20223060323 | 1980 | 278.55449732446 | 1979 | 294.83147121807 | 1978 | 286.89605160172 | 1977 | 264.28930023006 | 1976 | 244.30690514988 | 1975 | 213.89582047076 | 1974 | 219.87681376409 | 1973 | 207.42094036481 | 1972 | 184.82881876218 | 1971 | 172.32963233648 |
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