Year | Value | 2021 | 75.175 | 2020 | 75.555 | 2019 | 75.638 | 2018 | 75.168 | 2017 | 74.93 | 2016 | 71.005 | 2015 | 70.351 | 2014 | 68.945 | 2013 | 69.768 | 2012 | 71.816 | 2011 | 76.359 | 2010 | 76.682 | 2009 | 76.668 | 2008 | 76.275 | 2007 | 76.517 | 2006 | 75.978 | 2005 | 75.124 | 2004 | 74.752 | 2003 | 74.978 | 2002 | 74.356 | 2001 | 73.99 | 2000 | 73.114 | 1999 | 72.677 | 1998 | 72.223 | 1997 | 72.317 | 1996 | 72.377 | 1995 | 72.44 | 1994 | 72.129 | 1993 | 72.171 | 1992 | 72.206 | 1991 | 72.102 | 1990 | 71.649 | 1989 | 71.519 | 1988 | 71.386 | 1987 | 70.94 | 1986 | 70.734 | 1985 | 70.234 | 1984 | 70.576 | 1983 | 69.483 | 1982 | 65.225 | 1981 | 66.802 | 1980 | 68.013 | 1979 | 67.486 | 1978 | 66.965 | 1977 | 64.415 | 1976 | 64.646 | 1975 | 64.131 | 1974 | 63.886 | 1973 | 63.159 | 1972 | 62.739 | 1971 | 62.24 | 1970 | 61.179 | 1969 | 60.506 | 1968 | 59.911 | 1967 | 59.262 | 1966 | 58.403 | 1965 | 57.894 | 1964 | 57.276 | 1963 | 56.685 | 1962 | 55.886 | 1961 | 55.214 | 1960 | 54.368 |
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