Year | Value | 2021 | 72.4 | 2020 | 74.4 | 2019 | 74.5 | 2018 | 74 | 2017 | 73.8 | 2016 | 73.3 | 2015 | 73.2 | 2014 | 72.4 | 2013 | 72.8 | 2012 | 71.4 | 2011 | 71.4 | 2010 | 70.6 | 2009 | 69.8 | 2008 | 68.6 | 2007 | 67.4 | 2006 | 67.35 | 2005 | 67.3 | 2004 | 66.3 | 2003 | 66 | 2002 | 65.1 | 2001 | 64.6 | 2000 | 65.1 | 1999 | 64.6 | 1998 | 63.7 | 1997 | 64.2 | 1996 | 64.1 | 1995 | 61.3 | 1994 | 60.5 | 1993 | 62.3 | 1992 | 63.4 | 1991 | 64.3 | 1990 | 64.5 | 1989 | 65.6 | 1988 | 66.6 | 1987 | 66.4 | 1986 | 65.5 | 1985 | 64.6 | 1984 | 64.4 | 1983 | 64.4 | 1982 | 64.2 | 1981 | 64.1 | 1980 | 63.681 | 1979 | 63.84 | 1978 | 63.965 | 1977 | 64.578 | 1976 | 64.113 | 1975 | 64.669 | 1974 | 65.583 | 1973 | 65.458 | 1972 | 65.138 | 1971 | 65.362 | 1970 | 65.034 | 1969 | 64.922 | 1968 | 65.52 | 1967 | 65.886 | 1966 | 65.738 | 1965 | 65.81 | 1964 | 66.23 | 1963 | 65.155 | 1962 | 65.124 | 1961 | 65.067 | 1960 | 65.014 |
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