Year | Value | 2021 | 78 | 2020 | 78 | 2019 | 78.7 | 2018 | 78.3 | 2017 | 78.4 | 2016 | 78.1 | 2015 | 78.1 | 2014 | 78 | 2013 | 77.6 | 2012 | 77.3 | 2011 | 77.3 | 2010 | 76.1 | 2009 | 75.8 | 2008 | 75.5 | 2007 | 75.2 | 2006 | 75.2 | 2005 | 74.9 | 2004 | 74.5 | 2003 | 74 | 2002 | 73.7 | 2001 | 73.4 | 2000 | 72.9 | 1999 | 72.5 | 1998 | 72.2 | 1997 | 71.9 | 1996 | 71.7 | 1995 | 71.8 | 1994 | 71.5 | 1993 | 71 | 1992 | 70.8 | 1991 | 70.6 | 1990 | 70.6 | 1989 | 70.9 | 1988 | 70.3 | 1987 | 70.3 | 1986 | 69.9 | 1985 | 69.4 | 1984 | 69.1 | 1983 | 68.9 | 1982 | 69 | 1981 | 68.2 | 1980 | 67.8 | 1979 | 67.9 | 1978 | 67 | 1977 | 66.5 | 1976 | 65.3 | 1975 | 64.7 | 1974 | 64.8 | 1973 | 64.5 | 1972 | 65.3 | 1971 | 63.6 | 1970 | 64 | 1969 | 63.145 | 1968 | 63.626 | 1967 | 63.197 | 1966 | 62.374 | 1965 | 62.939 | 1964 | 62.119 | 1963 | 61.904 | 1962 | 61.282 | 1961 | 59.967 | 1960 | 61.266 |
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