Year | Value | 2021 | 83 | 2020 | 83.9 | 2019 | 84.2 | 2018 | 84.4 | 2017 | 83.9 | 2016 | 84 | 2015 | 83.7 | 2014 | 84.1 | 2013 | 84 | 2012 | 83.4 | 2011 | 83.6 | 2010 | 83 | 2009 | 82.8 | 2008 | 82.5 | 2007 | 82 | 2006 | 82 | 2005 | 81.8 | 2004 | 81.6 | 2003 | 81.3 | 2002 | 81.1 | 2001 | 81 | 2000 | 80.5 | 1999 | 80.6 | 1998 | 80.4 | 1997 | 80.8 | 1996 | 80.4 | 1995 | 80.3 | 1994 | 80.2 | 1993 | 79.9 | 1992 | 80.2 | 1991 | 79.8 | 1990 | 79.5 | 1989 | 79.3 | 1988 | 79.637 | 1987 | 78.827 | 1986 | 79.059 | 1985 | 78.607 | 1984 | 78.425 | 1983 | 78.175 | 1982 | 77.916 | 1981 | 77.648 | 1980 | 77.286 | 1979 | 77.369 | 1978 | 77.141 | 1977 | 76.409 | 1976 | 76.385 | 1975 | 75.986 | 1974 | 75.911 | 1973 | 75.524 | 1972 | 75.295 | 1971 | 75.485 | 1970 | 75.32 | 1969 | 74.405 | 1968 | 73.732 | 1967 | 73.555 | 1966 | 74.222 | 1965 | 73.746 | 1964 | 72.779 | 1963 | 72.772 | 1962 | 72.419 | 1961 | 72.527 | 1960 | 71.862 |
|