Year | Value | 2021 | 66.8 | 2020 | 67.841 | 2019 | 70.475 | 2018 | 70.383 | 2017 | 70.347 | 2016 | 70.259 | 2015 | 69.911 | 2014 | 69.771 | 2013 | 69.663 | 2012 | 69.312 | 2011 | 69.088 | 2010 | 68.688 | 2009 | 68.358 | 2008 | 67.857 | 2007 | 67.354 | 2006 | 67.106 | 2005 | 66.676 | 2004 | 66.242 | 2003 | 65.977 | 2002 | 65.556 | 2001 | 64.99 | 2000 | 64.394 | 1999 | 63.874 | 1998 | 63.207 | 1997 | 62.523 | 1996 | 61.885 | 1995 | 61.291 | 1994 | 60.718 | 1993 | 60.044 | 1992 | 59.093 | 1991 | 58.626 | 1990 | 57.886 | 1989 | 57.201 | 1988 | 56.511 | 1987 | 55.836 | 1986 | 55.192 | 1985 | 54.734 | 1984 | 54.23 | 1983 | 53.713 | 1982 | 53.351 | 1981 | 52.919 | 1980 | 52.529 | 1979 | 52.02 | 1978 | 51.589 | 1977 | 51.237 | 1976 | 50.807 | 1975 | 50.422 | 1974 | 49.95 | 1973 | 49.553 | 1972 | 49.12 | 1971 | 48.683 | 1970 | 48.215 | 1969 | 47.875 | 1968 | 47.544 | 1967 | 47.136 | 1966 | 46.894 | 1965 | 46.476 | 1964 | 46.161 | 1963 | 45.986 | 1962 | 45.635 | 1961 | 45.279 | 1960 | 45.076 |
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