Year | Value | 2021 | 85.4 | 2020 | 85.3 | 2019 | 85 | 2018 | 84.9 | 2017 | 84.6 | 2016 | 84.6 | 2015 | 84.5 | 2014 | 84.4 | 2013 | 84.3 | 2012 | 84.3 | 2011 | 84.2 | 2010 | 84 | 2009 | 83.9 | 2008 | 83.7 | 2007 | 83.7 | 2006 | 83.5 | 2005 | 83.3 | 2004 | 83 | 2003 | 82.8 | 2002 | 82.6 | 2001 | 82.4 | 2000 | 82 | 1999 | 81.8 | 1998 | 81.5 | 1997 | 81.4 | 1996 | 81.1 | 1995 | 80.8 | 1994 | 80.9 | 1993 | 80.9 | 1992 | 80.4 | 1991 | 80.4 | 1990 | 80.16 | 1989 | 79.92 | 1988 | 79.68 | 1987 | 79.44 | 1986 | 79.2 | 1985 | 79.02 | 1984 | 78.84 | 1983 | 78.66 | 1982 | 78.48 | 1981 | 78.3 | 1980 | 77.96 | 1979 | 77.62 | 1978 | 77.28 | 1977 | 76.94 | 1976 | 76.6 | 1975 | 76.18 | 1974 | 75.76 | 1973 | 75.34 | 1972 | 74.92 | 1971 | 74.5 | 1970 | 74.44 | 1969 | 74.38 | 1968 | 74.32 | 1967 | 74.26 | 1966 | 74.2 | 1965 | 74.2 | 1964 | 74.2 | 1963 | 74.2 | 1962 | 74.2 | 1961 | 74.2 | 1960 | 74 |
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