Year | Value | 2021 | 72.814 | 2020 | 73.649 | 2019 | 73.559 | 2018 | 73.59 | 2017 | 67.525 | 2016 | 70.128 | 2015 | 68.727 | 2014 | 69.434 | 2013 | 68.896 | 2012 | 70.538 | 2011 | 69.695 | 2010 | 71.55 | 2009 | 72.17 | 2008 | 73.305 | 2007 | 71.93 | 2006 | 72.848 | 2005 | 72.254 | 2004 | 72.401 | 2003 | 71.438 | 2002 | 72.34 | 2001 | 71.713 | 2000 | 72.693 | 1999 | 70.631 | 1998 | 71.472 | 1997 | 71.634 | 1996 | 71.194 | 1995 | 71.52 | 1994 | 71.076 | 1993 | 70.937 | 1992 | 70.282 | 1991 | 69.646 | 1990 | 69.852 | 1989 | 69.553 | 1988 | 71.364 | 1987 | 70.858 | 1986 | 71.322 | 1985 | 71.255 | 1984 | 72.022 | 1983 | 73.521 | 1982 | 72.993 | 1981 | 73.232 | 1980 | 71.782 | 1979 | 70.97 | 1978 | 70.441 | 1977 | 68.759 | 1976 | 68.985 | 1975 | 69.171 | 1974 | 68.785 | 1973 | 68.049 | 1972 | 67.11 | 1971 | 64.335 | 1970 | 65.468 | 1969 | 63.698 | 1968 | 64.416 | 1967 | 65.005 | 1966 | 63.49 | 1965 | 64.587 | 1964 | 64.493 | 1963 | 58.688 | 1962 | 61.741 | 1961 | 59.949 | 1960 | 59.026 |
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