Year | Value | 2021 | 68.771929824561 | 2020 | 69.824561403509 | 2019 | 70.701754385965 | 2018 | 70.701754385965 | 2017 | 70.526315789474 | 2016 | 71.40350877193 | 2015 | 70.877192982456 | 2014 | 68.245614035088 | 2013 | 68.070175438596 | 2012 | 67.368421052632 | 2011 | 74.754385964912 | 2010 | 76.105263157895 | 2009 | 76.175438596491 | 2008 | 77.684210526316 | 2007 | 73.894736842105 | 2006 | 74.315789473684 | 2005 | 80.894736842105 | 2004 | 80.350877192982 | 2003 | 80.298245614035 | 2002 | 79.649122807018 | 2001 | 77.543859649123 | 2000 | 76.842105263158 | 1999 | 76.140350877193 | 1998 | 75.438596491228 | 1997 | 74.561403508772 | 1996 | 73.859649122807 | 1995 | 73.157894736842 | 1994 | 72.456140350877 | 1993 | 71.578947368421 | 1992 | 70.877192982456 | 1991 | 70.175438596491 | 1990 | 69.473684210526 | 1989 | 68.59649122807 | 1988 | 67.894736842105 | 1987 | 67.19298245614 | 1986 | 66.491228070175 | 1985 | 65.614035087719 | 1984 | 64.912280701754 | 1983 | 64.210526315789 | 1982 | 63.684210526316 | 1981 | 62.80701754386 | 1980 | 62.105263157895 | 1979 | 61.228070175439 | 1978 | 60.526315789474 | 1977 | 59.824561403509 | 1976 | 59.122807017544 | 1975 | 58.245614035088 | 1974 | 57.543859649123 | 1973 | 56.842105263158 | 1972 | 56.140350877193 | 1971 | 55.438596491228 | 1970 | 55.438596491228 | 1969 | 55.438596491228 | 1968 | 54.736842105263 | 1967 | 54.561403508772 | 1966 | 54.385964912281 | 1965 | 56.140350877193 | 1964 | 55.78947368421 | 1963 | 56.491228070175 | 1962 | 57.017543859649 | 1961 | 57.017543859649 |
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