Year | Value | 2021 | 69.298 | 2020 | 69.364 | 2019 | 70.471 | 2018 | 70.233 | 2017 | 70.074 | 2016 | 69.948 | 2015 | 69.828 | 2014 | 69.662 | 2013 | 69.457 | 2012 | 69.243 | 2011 | 68.984 | 2010 | 68.925 | 2009 | 68.837 | 2008 | 68.808 | 2007 | 68.734 | 2006 | 68.706 | 2005 | 68.555 | 2004 | 68.064 | 2003 | 67.962 | 2002 | 67.403 | 2001 | 67.015 | 2000 | 66.713 | 1999 | 66.539 | 1998 | 66.406 | 1997 | 66.493 | 1996 | 66.475 | 1995 | 66.393 | 1994 | 66.18 | 1993 | 65.821 | 1992 | 65.388 | 1991 | 64.903 | 1990 | 64.403 | 1989 | 63.914 | 1988 | 63.446 | 1987 | 62.983 | 1986 | 62.512 | 1985 | 62.031 | 1984 | 61.542 | 1983 | 61.039 | 1982 | 60.531 | 1981 | 60.014 | 1980 | 59.514 | 1979 | 58.602 | 1978 | 58.53 | 1977 | 58.036 | 1976 | 57.528 | 1975 | 56.994 | 1974 | 56.426 | 1973 | 55.829 | 1972 | 55.21 | 1971 | 54.578 | 1970 | 53.943 | 1969 | 53.316 | 1968 | 52.703 | 1967 | 52.103 | 1966 | 51.493 | 1965 | 47.05 | 1964 | 50.376 | 1963 | 49.682 | 1962 | 49.262 | 1961 | 48.705 | 1960 | 48.148 |
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