Year | Value | 2021 | 83.355 | 2020 | 83.387 | 2019 | 83.499 | 2018 | 83.525 | 2017 | 83.481 | 2016 | 83.474 | 2015 | 83.552 | 2014 | 84.057 | 2013 | 83.659 | 2012 | 83.432 | 2011 | 83.891 | 2010 | 83.246 | 2009 | 83.175 | 2008 | 83.413 | 2007 | 83.268 | 2006 | 82.846 | 2005 | 82.472 | 2004 | 82.277 | 2003 | 81.775 | 2002 | 81.135 | 2001 | 81.499 | 2000 | 81.393 | 1999 | 81.192 | 1998 | 81.167 | 1997 | 80.483 | 1996 | 80.289 | 1995 | 80.105 | 1994 | 80.28 | 1993 | 79.218 | 1992 | 80.867 | 1991 | 78.824 | 1990 | 79.723 | 1989 | 79.661 | 1988 | 79.525 | 1987 | 79.191 | 1986 | 78.303 | 1985 | 77.927 | 1984 | 78.684 | 1983 | 76.955 | 1982 | 77.593 | 1981 | 76.825 | 1980 | 76.468 | 1979 | 75.73 | 1978 | 76.299 | 1977 | 75.91 | 1976 | 75.662 | 1975 | 74.945 | 1974 | 75.429 | 1973 | 75.379 | 1972 | 75.155 | 1971 | 74.923 | 1970 | 74.55 | 1969 | 74.707 | 1968 | 74.386 | 1967 | 76.176 | 1966 | 75.366 | 1965 | 75.149 | 1964 | 75.413 | 1963 | 73.536 | 1962 | 74.796 | 1961 | 73.006 | 1960 | 74.507 |
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