Year | Value | 2014 | 80.90454837738 | 2013 | 79.911417664804 | 2012 | 80.469257056244 | 2011 | 82.776113998145 | 2010 | 81.427173621177 | 2009 | 75.01478192436 | 2008 | 70.924587666012 | 2007 | 75.555624090364 | 2006 | 74.402906730099 | 2005 | 73.511903025828 | 2004 | 69.433000697212 | 2003 | 72.314197292975 | 2002 | 70.451212346225 | 2001 | 75.216286455045 | 2000 | 70.593465076059 | 1999 | 71.206102174757 | 1998 | 75.004488933904 | 1997 | 68.268613636118 | 1996 | 67.143942723125 | 1995 | 69.742253818068 | 1994 | 66.926008353404 | 1993 | 64.548937354194 | 1992 | 66.15288417124 | 1991 | 62.714888898789 | 1990 | 58.931716746776 | 1989 | 58.788482773889 | 1988 | 61.34542230829 | 1987 | 64.609675037581 | 1986 | 61.828374826996 | 1985 | 61.275159696276 | 1984 | 63.235567220909 | 1983 | 69.408468597225 | 1982 | 65.605906498601 | 1981 | 62.308348744118 | 1980 | 62.665948274336 | 1979 | 71.227516857852 | 1978 | 69.948911136977 | 1977 | 73.281976979743 | 1976 | 75.828492970779 | 1975 | 77.531017941977 | 1974 | 81.686659316648 | 1973 | 83.171064369392 | 1972 | 81.811434047932 | 1971 | 79.327899165551 |
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