Year | Value | 2021 | 80.704 | 2020 | 81.868 | 2019 | 81.576 | 2018 | 81.314 | 2017 | 81.043 | 2016 | 80.771 | 2015 | 80.532 | 2014 | 80.68 | 2013 | 80.526 | 2012 | 80.657 | 2011 | 80.979 | 2010 | 80.524 | 2009 | 80.225 | 2008 | 80.193 | 2007 | 80.01 | 2006 | 80.07 | 2005 | 79.923 | 2004 | 79.532 | 2003 | 79.429 | 2002 | 79.129 | 2001 | 78.649 | 2000 | 77.398 | 1999 | 77.087 | 1998 | 76.739 | 1997 | 76.448 | 1996 | 76.209 | 1995 | 76.592 | 1994 | 76.394 | 1993 | 76.26 | 1992 | 76.221 | 1991 | 76.088 | 1990 | 75.818 | 1989 | 75.942 | 1988 | 75.711 | 1987 | 75.397 | 1986 | 75.189 | 1985 | 74.921 | 1984 | 74.691 | 1983 | 74.469 | 1982 | 74.167 | 1981 | 73.949 | 1980 | 73.721 | 1979 | 73.504 | 1978 | 72.864 | 1977 | 72.063 | 1976 | 71.082 | 1975 | 70.51 | 1974 | 70.112 | 1973 | 69.82 | 1972 | 69.422 | 1971 | 68.95 | 1970 | 68.794 | 1969 | 68.198 | 1968 | 68.135 | 1967 | 67.299 | 1966 | 66.073 | 1965 | 66.068 | 1964 | 65.78 | 1963 | 65.229 | 1962 | 64.482 | 1961 | 64.225 | 1960 | 63.71 |
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