Year | Value | 2014 | 90.72183409217 | 2013 | 90.245584944798 | 2012 | 90.940599899896 | 2011 | 90.482611513011 | 2010 | 88.764679605659 | 2009 | 88.543139611324 | 2008 | 88.316560083009 | 2007 | 86.866360068582 | 2006 | 85.571990169484 | 2005 | 84.382209698026 | 2004 | 81.899361252919 | 2003 | 87.802272629792 | 2002 | 88.382467154488 | 2001 | 88.271028865483 | 2000 | 87.734864381149 | 1999 | 87.321643214177 | 1998 | 85.138934731079 | 1997 | 84.173170140524 | 1996 | 83.401542584725 | 1995 | 83.164820402919 | 1994 | 83.249723206465 | 1993 | 82.885444129239 | 1992 | 82.074741708835 | 1991 | 80.944819417394 | 1990 | 80.984575255435 | 1989 | 81.043206575167 | 1988 | 78.537384176655 | 1987 | 77.958003384623 | 1986 | 76.410699566134 | 1985 | 76.189093898104 | 1984 | 75.881692361222 | 1983 | 76.104842175364 | 1982 | 75.594686208523 | 1981 | 74.467834362064 | 1980 | 73.833626418665 | 1979 | 73.071627634988 | 1978 | 71.597177284526 | 1977 | 70.343764496532 | 1976 | 69.009015702654 | 1975 | 67.581243314249 | 1974 | 67.021573666168 | 1973 | 64.957968051463 | 1972 | 61.674788819829 | 1971 | 61.280711617015 |
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