Year | Value | 2014 | 86.717100223576 | 2013 | 86.593935344842 | 2012 | 87.235237027193 | 2011 | 87.170577873891 | 2010 | 86.918579480835 | 2009 | 86.283083082748 | 2008 | 86.58322960882 | 2007 | 86.055249517205 | 2006 | 85.945088652326 | 2005 | 85.347250442894 | 2004 | 84.292697283616 | 2003 | 86.648298997518 | 2002 | 87.388573538067 | 2001 | 87.332381019302 | 2000 | 87.444782901856 | 1999 | 86.11172966488 | 1998 | 86.073219769232 | 1997 | 87.177421756399 | 1996 | 85.567702807342 | 1995 | 84.918005044788 | 1994 | 83.564930180686 | 1993 | 81.037561038412 | 1992 | 78.781070515631 | 1991 | 76.178399885739 | 1990 | 76.456313218741 | 1989 | 78.539462014861 | 1988 | 75.612705748038 | 1987 | 72.393523498301 | 1986 | 68.75879384691 | 1985 | 67.65281185146 | 1984 | 58.141887643469 | 1983 | 58.709761196676 | 1982 | 52.284155264355 | 1981 | 56.22353129558 | 1980 | 61.368555471899 | 1979 | 59.717805846689 | 1978 | 59.409010767301 | 1977 | 59.841918320475 | 1976 | 58.123083504325 | 1975 | 59.220236269417 | 1974 | 58.73216888723 | 1973 | 57.877143106305 | 1972 | 54.350423583028 | 1971 | 48.218233926679 |
|