Year | Value | 2015 | 71.432660289743 | 2014 | 69.359789615631 | 2013 | 70.343061133229 | 2012 | 73.310559671921 | 2011 | 74.557082986341 | 2010 | 73.049632738388 | 2009 | 76.236919350433 | 2008 | 78.176919526593 | 2007 | 78.940031355958 | 2006 | 77.900834451248 | 2005 | 78.751043013077 | 2004 | 76.592458351625 | 2003 | 75.273975041725 | 2002 | 75.418401412956 | 2001 | 73.223072808829 | 2000 | 74.100168645509 | 1999 | 73.62370849185 | 1998 | 70.834821181649 | 1997 | 69.967925517044 | 1996 | 67.072322606997 | 1995 | 68.733125717223 | 1994 | 66.523372810288 | 1993 | 63.931798446674 | 1992 | 64.577540059751 | 1991 | 63.24910656328 | 1990 | 61.596918697487 | 1989 | 60.788046507773 | 1988 | 62.21762475279 | 1987 | 62.379567102799 | 1986 | 60.873642765088 | 1985 | 62.666863356934 | 1984 | 63.927350413763 | 1983 | 67.728814143556 | 1982 | 70.618833647782 | 1981 | 74.238100046795 | 1980 | 76.698561313682 | 1979 | 76.201354898762 | 1978 | 77.558612219997 | 1977 | 76.170393278456 | 1976 | 79.55933049759 | 1975 | 76.768286523791 | 1974 | 76.4836778516 | 1973 | 77.995431245303 | 1972 | 74.16354616603 | 1971 | 75.473200154212 | 1970 | 74.497996837629 | 1969 | 70.461164281798 | 1968 | 69.44510327642 | 1967 | 66.052831261823 | 1966 | 58.891017773238 | 1965 | 56.87308869238 | 1964 | 56.232453755654 | 1963 | 48.765731693262 | 1962 | 50.398552498017 | 1961 | 41.954707137333 | 1960 | 39.100491182755 |
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