Year | Value | 2021 | 77.697 | 2020 | 77.866 | 2019 | 79.4 | 2018 | 79.4 | 2017 | 79.2 | 2016 | 79 | 2015 | 78.9 | 2014 | 78.4 | 2013 | 77.9 | 2012 | 77.6 | 2011 | 76.7 | 2010 | 76.5 | 2009 | 76.4 | 2008 | 76.5 | 2007 | 76.2 | 2006 | 75.5 | 2005 | 75.1 | 2004 | 75 | 2003 | 74.7 | 2002 | 74.1 | 2001 | 74.5 | 2000 | 74.7 | 1999 | 73.9 | 1998 | 74.4 | 1997 | 74.3 | 1996 | 74.3 | 1995 | 74.3 | 1994 | 74.3 | 1993 | 74.4 | 1992 | 75.4 | 1991 | 75.5 | 1990 | 75.6 | 1989 | 76.4 | 1988 | 75.9 | 1987 | 75.6 | 1986 | 75.98 | 1985 | 75.5 | 1984 | 74.553 | 1983 | 74.505 | 1982 | 74.806 | 1981 | 74.443 | 1980 | 74.308 | 1979 | 74.611 | 1978 | 74.335 | 1977 | 74.614 | 1976 | 74.52 | 1975 | 74.653 | 1974 | 74.816 | 1973 | 74.753 | 1972 | 74.721 | 1971 | 74.657 | 1970 | 74.714 | 1969 | 75.009 | 1968 | 74.497 | 1967 | 74.74 | 1966 | 74.405 | 1965 | 74.273 | 1964 | 74.2 | 1963 | 73.121 | 1962 | 73.04 | 1961 | 73.124 | 1960 | 72.736 |
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