Year | Value | 2021 | 83.3 | 2020 | 83.6 | 2019 | 83.5 | 2018 | 82.9 | 2017 | 83.1 | 2016 | 82.8 | 2015 | 82.7 | 2014 | 82.8 | 2013 | 82.4 | 2012 | 82.1 | 2011 | 81.9 | 2010 | 81.2 | 2009 | 80.8 | 2008 | 80.7 | 2007 | 80.5 | 2006 | 80.4 | 2005 | 80.2 | 2004 | 79.9 | 2003 | 79.5 | 2002 | 79.2 | 2001 | 79.2 | 2000 | 79 | 1999 | 78.8 | 1998 | 78.7 | 1997 | 78.46 | 1996 | 78.26 | 1995 | 77.83 | 1994 | 78.1 | 1993 | 77.77 | 1992 | 77.96 | 1991 | 77.98 | 1990 | 77.73 | 1989 | 77.75 | 1988 | 77.64 | 1987 | 77.79 | 1986 | 77.53 | 1985 | 77.47 | 1984 | 77.62 | 1983 | 77.55 | 1982 | 77.65 | 1981 | 77.36 | 1980 | 77.18 | 1979 | 77.4 | 1978 | 77.42 | 1977 | 77.68 | 1976 | 76.69 | 1975 | 77.01 | 1974 | 76.82 | 1973 | 76.53 | 1972 | 76.21 | 1971 | 76.16 | 1970 | 75.93 | 1969 | 75.7 | 1968 | 75.58 | 1967 | 75.35 | 1966 | 74.79 | 1965 | 74.65 | 1964 | 74.79 | 1963 | 74.48 | 1962 | 74.43 | 1961 | 74.4 | 1960 | 74 |
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