Year | Value | 2021 | 80.937 | 2020 | 81.112 | 2019 | 81.907 | 2018 | 81.79 | 2017 | 81.626 | 2016 | 81.396 | 2015 | 81.212 | 2014 | 81.023 | 2013 | 80.828 | 2012 | 80.623 | 2011 | 80.415 | 2010 | 80.203 | 2009 | 79.982 | 2008 | 79.75 | 2007 | 79.52 | 2006 | 79.289 | 2005 | 79.033 | 2004 | 78.784 | 2003 | 78.521 | 2002 | 77.35 | 2001 | 76.998 | 2000 | 76.617 | 1999 | 76.193 | 1998 | 75.676 | 1997 | 75.534 | 1996 | 75.343 | 1995 | 75.633 | 1994 | 75.595 | 1993 | 75.524 | 1992 | 74.99 | 1991 | 75.04 | 1990 | 74.922 | 1989 | 74.788 | 1988 | 74.648 | 1987 | 74.513 | 1986 | 73.775 | 1985 | 73.64 | 1984 | 73.412 | 1983 | 72.876 | 1982 | 72.604 | 1981 | 72.006 | 1980 | 71.67 | 1979 | 70.965 | 1978 | 70.28 | 1977 | 69.535 | 1976 | 68.816 | 1975 | 68.035 | 1974 | 67.239 | 1973 | 66.47 | 1972 | 65.185 | 1971 | 64.31 | 1970 | 63.121 | 1969 | 61.829 | 1968 | 60.539 | 1967 | 59.421 | 1966 | 58.184 | 1965 | 56.894 | 1964 | 55.775 | 1963 | 54.642 | 1962 | 53.765 | 1961 | 52.794 | 1960 | 52.034 |
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