Year | Value | 2014 | 84.542288947718 | 2013 | 83.781098499144 | 2012 | 83.153170082759 | 2011 | 82.439632565824 | 2010 | 81.656224354463 | 2009 | 81.04683310488 | 2008 | 79.388917537672 | 2007 | 80.325615282381 | 2006 | 79.503695193069 | 2005 | 77.398201945783 | 2004 | 75.463815449711 | 2003 | 75.841454901499 | 2002 | 75.420726895909 | 2001 | 73.527936773678 | 2000 | 73.86310096487 | 1999 | 75.802065684011 | 1998 | 65.491657384335 | 1997 | 63.78778712717 | 1996 | 65.393912832729 | 1995 | 63.295400948672 | 1994 | 65.872861878513 | 1993 | 62.6784868104 | 1992 | 59.048043615096 | 1991 | 58.455522827688 | 1990 | 55.45939667514 | 1989 | 54.181110544186 | 1988 | 53.307496768875 | 1987 | 47.87591001459 | 1986 | 47.133982621791 | 1985 | 43.493337374715 | 1984 | 46.877280307068 | 1983 | 45.752747960247 | 1982 | 41.721648307052 | 1981 | 43.670197551357 | 1980 | 42.895347219001 | 1979 | 44.091404042404 | 1978 | 43.885417931729 | 1977 | 41.626984671543 | 1976 | 37.810182920396 | 1975 | 34.176721876639 | 1974 | 32.591590198955 | 1973 | 28.119123247839 | 1972 | 25.465155456126 | 1971 | 23.383462773402 |
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