Year | Value | 2021 | 66.803 | 2020 | 67.74 | 2019 | 68.493 | 2018 | 68.495 | 2017 | 68.836 | 2016 | 68.696 | 2015 | 68.477 | 2014 | 68.309 | 2013 | 67.866 | 2012 | 67.651 | 2011 | 67.856 | 2010 | 67.603 | 2009 | 67.391 | 2008 | 66.705 | 2007 | 67.193 | 2006 | 66.731 | 2005 | 66.529 | 2004 | 66.166 | 2003 | 65.853 | 2002 | 65.537 | 2001 | 65.225 | 2000 | 65.348 | 1999 | 65.09 | 1998 | 64.879 | 1997 | 64.583 | 1996 | 64.325 | 1995 | 64.245 | 1994 | 64.176 | 1993 | 62.607 | 1992 | 62.911 | 1991 | 63.583 | 1990 | 63.827 | 1989 | 63.819 | 1988 | 64.148 | 1987 | 64.046 | 1986 | 64.074 | 1985 | 64.046 | 1984 | 63.834 | 1983 | 63.622 | 1982 | 63.741 | 1981 | 63.413 | 1980 | 63.239 | 1979 | 62.785 | 1978 | 62.508 | 1977 | 62.155 | 1976 | 61.767 | 1975 | 61.476 | 1974 | 61.235 | 1973 | 61.107 | 1972 | 60.632 | 1971 | 60.267 | 1970 | 59.985 | 1969 | 59.793 | 1968 | 59.559 | 1967 | 59.095 | 1966 | 58.771 | 1965 | 58.749 | 1964 | 58.271 | 1963 | 57.918 | 1962 | 57.654 | 1961 | 57.251 | 1960 | 57.125 |
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