Year | Value | 2021 | 77 | 2020 | 78.8 | 2019 | 79.5 | 2018 | 79.3 | 2017 | 79.2 | 2016 | 78.9 | 2015 | 78.6 | 2014 | 78.9 | 2013 | 79 | 2012 | 78.3 | 2011 | 78.8 | 2010 | 78.5 | 2009 | 77.5 | 2008 | 77.8 | 2007 | 76.9 | 2006 | 76.4 | 2005 | 76.8 | 2004 | 77.8 | 2003 | 76.841 | 2002 | 77.057 | 2001 | 77.013 | 2000 | 76.717 | 1999 | 75.969 | 1998 | 77.463 | 1997 | 77.361 | 1996 | 77.032 | 1995 | 78.225 | 1994 | 76.457 | 1993 | 79.409 | 1992 | 79.306 | 1991 | 81.516 | 1990 | 80.822 | 1989 | 79.889 | 1988 | 80.751 | 1987 | 78.542 | 1986 | 77.88 | 1985 | 77.43 | 1984 | 76.663 | 1983 | 74.82 | 1982 | 74.619 | 1981 | 74.525 | 1980 | 74.901 | 1979 | 73.346 | 1978 | 74.172 | 1977 | 74.332 | 1976 | 74.512 | 1975 | 73.999 | 1974 | 74.129 | 1973 | 73.509 | 1972 | 73.348 | 1971 | 72.568 | 1970 | 71.499 | 1969 | 71.795 | 1968 | 71.981 | 1967 | 71.515 | 1966 | 71.472 | 1965 | 70.555 | 1964 | 69.606 | 1963 | 69.222 | 1962 | 68.272 | 1961 | 67.682 | 1960 | 67.095 |
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