Year | Value | 2021 | 73.680243902439 | 2020 | 74.177073170732 | 2019 | 74.235853658537 | 2018 | 74.416341463415 | 2017 | 74.514634146342 | 2016 | 74.39487804878 | 2015 | 74.353170731707 | 2014 | 74.194390243902 | 2013 | 74.017073170732 | 2012 | 73.863414634146 | 2011 | 73.266829268293 | 2010 | 72.967317073171 | 2009 | 72.88243902439 | 2008 | 72.570731707317 | 2007 | 72.570731707317 | 2006 | 72.432195121951 | 2005 | 72.432195121951 | 2004 | 72.265853658537 | 2003 | 72.117073170732 | 2002 | 71.965853658537 | 2001 | 71.765853658537 | 2000 | 71.663414634146 | 1999 | 70.960975609756 | 1998 | 70.607317073171 | 1997 | 70.404878048781 | 1996 | 70.322926829268 | 1995 | 70.325853658537 | 1994 | 70.158536585366 | 1993 | 70.107317073171 | 1992 | 70.058536585366 | 1991 | 69.956097560976 | 1990 | 69.404878048781 | 1989 | 68.95 | 1988 | 68.361219512195 | 1987 | 68.096975609756 | 1986 | 67.771048780488 | 1985 | 67.490634146342 | 1984 | 67.343902439024 | 1983 | 67.285634146341 | 1982 | 67.034756097561 | 1981 | 66.547951219512 | 1980 | 65.816487804878 | 1979 | 65.30643902439 | 1978 | 64.593926829268 | 1977 | 63.762097560976 | 1976 | 62.866780487805 | 1975 | 62.355804878049 | 1974 | 61.643756097561 | 1973 | 61.056707317073 | 1972 | 60.733463414634 | 1971 | 60.988975609756 | 1970 | 61.000365853659 | 1969 | 59.855 | 1968 | 58.666804878049 | 1967 | 58.320536585366 | 1966 | 59.150195121951 | 1965 | 59.567853658537 | 1964 | 59.14 | 1963 | 58.353219512195 | 1962 | 57.491292682927 | 1961 | 56.521975609756 | 1960 | 55.466536585366 |
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