Year | Value | 2021 | 69.725 | 2020 | 70.433 | 2019 | 70.355 | 2018 | 70.405 | 2017 | 65.596 | 2016 | 67.571 | 2015 | 66.587 | 2014 | 67.096 | 2013 | 66.78 | 2012 | 68.214 | 2011 | 66.906 | 2010 | 68.698 | 2009 | 69.932 | 2008 | 70.728 | 2007 | 69.421 | 2006 | 69.911 | 2005 | 69.308 | 2004 | 70.457 | 2003 | 69.176 | 2002 | 69.538 | 2001 | 69.09 | 2000 | 70.392 | 1999 | 68.195 | 1998 | 69.204 | 1997 | 69.246 | 1996 | 68.106 | 1995 | 68.72 | 1994 | 68.648 | 1993 | 68.124 | 1992 | 67.144 | 1991 | 67.433 | 1990 | 67.265 | 1989 | 66.623 | 1988 | 68.356 | 1987 | 67.752 | 1986 | 68.22 | 1985 | 69.925 | 1984 | 70.958 | 1983 | 72.029 | 1982 | 71.293 | 1981 | 71.058 | 1980 | 69.138 | 1979 | 68.696 | 1978 | 67.894 | 1977 | 66.588 | 1976 | 65.955 | 1975 | 66.327 | 1974 | 66.663 | 1973 | 65.857 | 1972 | 64.671 | 1971 | 63.215 | 1970 | 63.466 | 1969 | 62.334 | 1968 | 62.988 | 1967 | 62.729 | 1966 | 60.822 | 1965 | 62.92 | 1964 | 62.855 | 1963 | 57.698 | 1962 | 60.704 | 1961 | 58.636 | 1960 | 57.955 |
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