Year | Value | 2021 | 84.5 | 2020 | 84.6 | 2019 | 84.7 | 2018 | 84.5 | 2017 | 84.3 | 2016 | 84.1 | 2015 | 83.8 | 2014 | 84.5 | 2013 | 83.7 | 2012 | 84.3 | 2011 | 84.1 | 2010 | 84.1 | 2009 | 83.8 | 2008 | 83.3 | 2007 | 83.4 | 2006 | 82.9 | 2005 | 83.5 | 2004 | 83.2 | 2003 | 82.5 | 2002 | 82.5 | 2001 | 83.2 | 2000 | 81.6 | 1999 | 81.4 | 1998 | 81.6 | 1997 | 81.6 | 1996 | 81.18 | 1995 | 80.11 | 1994 | 81.47 | 1993 | 80.84 | 1992 | 80.85 | 1991 | 81.27 | 1990 | 80.71 | 1989 | 80.2 | 1988 | 79.9 | 1987 | 79.9 | 1986 | 80.69 | 1985 | 80.44 | 1984 | 80.45 | 1983 | 80.6 | 1982 | 79.65 | 1981 | 79.82 | 1980 | 80.35 | 1979 | 80 | 1978 | 79.62 | 1977 | 79.58 | 1976 | 80.24 | 1975 | 78.99 | 1974 | 78.01 | 1973 | 77.56 | 1972 | 76.94 | 1971 | 76.49 | 1970 | 77.34 | 1969 | 76.45 | 1968 | 76.49 | 1967 | 76.59 | 1966 | 76.43 | 1965 | 76.44 | 1964 | 76.41 | 1963 | 76.07 | 1962 | 76.16 | 1961 | 76.3 | 1960 | 75.503 |
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