Year | Value | 2021 | 72.370682926829 | 2020 | 72.457219512195 | 2019 | 74.226829268293 | 2018 | 74.175609756098 | 2017 | 74.129268292683 | 2016 | 73.826829268293 | 2015 | 73.624390243902 | 2014 | 72.970731707317 | 2013 | 72.470731707317 | 2012 | 71.965853658537 | 2011 | 70.553658536585 | 2010 | 70.404878048781 | 2009 | 70.407317073171 | 2008 | 70.456097560976 | 2007 | 70.207317073171 | 2006 | 69.404878048781 | 2005 | 68.851219512195 | 2004 | 68.956097560976 | 2003 | 68.553658536585 | 2002 | 68.056097560976 | 2001 | 68.507317073171 | 2000 | 68.912195121951 | 1999 | 67.907317073171 | 1998 | 68.407317073171 | 1997 | 68.460975609756 | 1996 | 68.512195121951 | 1995 | 68.460975609756 | 1994 | 68.768292682927 | 1993 | 68.970731707317 | 1992 | 70.021951219512 | 1991 | 70.378048780488 | 1990 | 70.836585365854 | 1989 | 71.482926829268 | 1988 | 71.341463414634 | 1987 | 70.990243902439 | 1986 | 71.549512195122 | 1985 | 70.992682926829 | 1984 | 69.563195121951 | 1983 | 69.794853658537 | 1982 | 70.076902439024 | 1981 | 69.907512195122 | 1980 | 69.927707317073 | 1979 | 69.933634146342 | 1978 | 70.081731707317 | 1977 | 70.289024390244 | 1976 | 70.396829268293 | 1975 | 70.457097560976 | 1974 | 70.854682926829 | 1973 | 71.000658536585 | 1972 | 70.849317073171 | 1971 | 71.011707317073 | 1970 | 70.744487804878 | 1969 | 70.978024390244 | 1968 | 70.812780487805 | 1967 | 70.929780487805 | 1966 | 70.768926829268 | 1965 | 70.597487804878 | 1964 | 70.619243902439 | 1963 | 69.709780487805 | 1962 | 69.462317073171 | 1961 | 69.738390243902 | 1960 | 69.254609756098 |
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