Year | Value | 2021 | 69.647804878049 | 2020 | 71.18512195122 | 2019 | 71.827317073171 | 2018 | 71.582682926829 | 2017 | 71.780975609756 | 2016 | 71.476341463415 | 2015 | 71.189512195122 | 2014 | 71.186585365854 | 2013 | 71.159512195122 | 2012 | 70.944146341463 | 2011 | 70.809268292683 | 2010 | 70.265365853659 | 2009 | 69.19 | 2008 | 68.251463414634 | 2007 | 68.222195121951 | 2006 | 68.07756097561 | 2005 | 67.956829268293 | 2004 | 68.185365853658 | 2003 | 68.210731707317 | 2002 | 68.275609756098 | 2001 | 67.837073170732 | 2000 | 67.675609756098 | 1999 | 67.980975609756 | 1998 | 68.374878048781 | 1997 | 67.576341463415 | 1996 | 67.02243902439 | 1995 | 66.741951219512 | 1994 | 67.541219512195 | 1993 | 68.130731707317 | 1992 | 68.770975609756 | 1991 | 69.298048780488 | 1990 | 70.09756097561 | 1989 | 70.519512195122 | 1988 | 70.49756097561 | 1987 | 70.49512195122 | 1986 | 70.066292682927 | 1985 | 68.613121951219 | 1984 | 68.505804878049 | 1983 | 68.846390243903 | 1982 | 68.875682926829 | 1981 | 68.598195121951 | 1980 | 68.330170731707 | 1979 | 68.469682926829 | 1978 | 68.759975609756 | 1977 | 68.81856097561 | 1976 | 69.042853658537 | 1975 | 69.046317073171 | 1974 | 68.934024390244 | 1973 | 69.043097560976 | 1972 | 68.917292682927 | 1971 | 69.037756097561 | 1970 | 68.808975609756 | 1969 | 68.975609756098 | 1968 | 69.554780487805 | 1967 | 69.561536585366 | 1966 | 69.730951219512 | 1965 | 69.868390243902 | 1964 | 70.205512195122 | 1963 | 69.787487804878 | 1962 | 69.334585365854 | 1961 | 69.572365853659 | 1960 | 69.485048780488 |
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