Year | Value | 2021 | 84.3 | 2020 | 84.1 | 2019 | 84.8 | 2018 | 84.5 | 2017 | 84.6 | 2016 | 84.3 | 2015 | 84.3 | 2014 | 84.4 | 2013 | 84 | 2012 | 83.6 | 2011 | 83.8 | 2010 | 82.1 | 2009 | 81.8 | 2008 | 81.7 | 2007 | 81.6 | 2006 | 81.8 | 2005 | 81.4 | 2004 | 81 | 2003 | 80.6 | 2002 | 80.6 | 2001 | 80.4 | 2000 | 79.9 | 1999 | 79.6 | 1998 | 79.4 | 1997 | 79.1 | 1996 | 79 | 1995 | 79 | 1994 | 78.5 | 1993 | 78.2 | 1992 | 78 | 1991 | 77.6 | 1990 | 77.5 | 1989 | 77.8 | 1988 | 77.3 | 1987 | 77.2 | 1986 | 76.8 | 1985 | 76.4 | 1984 | 76.1 | 1983 | 75.8 | 1982 | 76 | 1981 | 75.2 | 1980 | 74.8 | 1979 | 74.6 | 1978 | 73.8 | 1977 | 73.7 | 1976 | 72.6 | 1975 | 72.1 | 1974 | 71.4 | 1973 | 70.7 | 1972 | 71.5 | 1971 | 70.1 | 1970 | 70.3 | 1969 | 69.568 | 1968 | 69.883 | 1967 | 69.628 | 1966 | 68.757 | 1965 | 69.133 | 1964 | 67.991 | 1963 | 67.817 | 1962 | 67.225 | 1961 | 65.501 | 1960 | 66.886 |
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