Year | Value | 2021 | 64.929460580913 | 2020 | 67.751428571429 | 2019 | 70.652375415282 | 2018 | 71.227724252492 | 2017 | 71.387790697674 | 2016 | 72.162491694352 | 2015 | 71.495315614618 | 2014 | 69.843106312292 | 2013 | 68.842043189369 | 2012 | 66.551943521595 | 2011 | 64.324983388704 | 2010 | 62.275747508306 | 2009 | 71.387043189369 | 2008 | 77.932956810631 | 2007 | 77.62938538206 | 2006 | 77.481777408638 | 2005 | 77.61061461794 | 2004 | 77.391661129568 | 2003 | 77.325066445183 | 2002 | 77.870946843854 | 2001 | 77.227392026578 | 2000 | 77.776262458472 | 1999 | 74.352126245847 | 1998 | 78.089285714286 | 1997 | 77.829435215947 | 1996 | 78.069850498339 | 1995 | 78.892475083056 | 1994 | 77.546445182724 | 1993 | 82.558139534884 | 1992 | 82.558139534884 | 1991 | 82.890365448505 | 1990 | 83.222591362126 | 1989 | 83.554817275747 | 1988 | 83.388704318937 | 1987 | 83.388704318937 | 1986 | 83.388704318937 | 1985 | 83.388704318937 | 1984 | 83.554817275747 | 1983 | 83.388704318937 | 1982 | 83.056478405316 | 1981 | 82.724252491694 | 1980 | 82.059800664452 | 1979 | 81.893687707641 | 1978 | 81.893687707641 | 1977 | 81.56146179402 | 1976 | 81.229235880399 | 1975 | 80.730897009967 | 1974 | 80.730897009967 | 1973 | 80.564784053156 | 1972 | 80.398671096345 | 1971 | 80.398671096345 | 1970 | 80.398671096345 | 1969 | 80.066445182724 | 1968 | 80.066445182724 | 1967 | 80.066445182724 | 1966 | 79.734219269103 | 1965 | 79.568106312292 | 1964 | 79.568106312292 | 1963 | 79.568106312292 | 1962 | 79.568106312292 | 1961 | 79.568106312292 |
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