Year | Value | 2021 | 75.341 | 2020 | 75.266 | 2019 | 75.195 | 2018 | 75.085 | 2017 | 75.922 | 2016 | 75.941 | 2015 | 74.921 | 2014 | 74.928 | 2013 | 75.196 | 2012 | 74.795 | 2011 | 74.614 | 2010 | 74.434 | 2009 | 74.995 | 2008 | 74.768 | 2007 | 74.614 | 2006 | 74.317 | 2005 | 74.639 | 2004 | 75.196 | 2003 | 74.466 | 2002 | 73.672 | 2001 | 72.838 | 2000 | 72.29 | 1999 | 71.015 | 1998 | 70.226 | 1997 | 70.589 | 1996 | 69.996 | 1995 | 70.011 | 1994 | 70.055 | 1993 | 70.218 | 1992 | 69.74 | 1991 | 68.682 | 1990 | 67.61 | 1989 | 67.524 | 1988 | 67.954 | 1987 | 68.27 | 1986 | 68.406 | 1985 | 68.815 | 1984 | 67.589 | 1983 | 66.25 | 1982 | 66.085 | 1981 | 66.204 | 1980 | 66.283 | 1979 | 65.951 | 1978 | 66.405 | 1977 | 67.119 | 1976 | 67.32 | 1975 | 66.301 | 1974 | 64.666 | 1973 | 62.995 | 1972 | 62.984 | 1971 | 63.551 | 1970 | 63.827 | 1969 | 62.82 | 1968 | 62.575 | 1967 | 62.397 | 1966 | 61.94 | 1965 | 61.483 | 1964 | 60.538 | 1963 | 59.931 | 1962 | 58.584 | 1961 | 57.414 | 1960 | 57.197 |
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