Year | Value | 2021 | 67.894 | 2020 | 69.126 | 2019 | 70.534 | 2018 | 70.461 | 2017 | 70.351 | 2016 | 70.257 | 2015 | 70.15 | 2014 | 70.036 | 2013 | 69.613 | 2012 | 69.471 | 2011 | 69.261 | 2010 | 69.038 | 2009 | 68.983 | 2008 | 68.549 | 2007 | 68.498 | 2006 | 68.335 | 2005 | 68.191 | 2004 | 67.677 | 2003 | 67.566 | 2002 | 67.413 | 2001 | 66.883 | 2000 | 66.652 | 1999 | 66.413 | 1998 | 61.834 | 1997 | 65.782 | 1996 | 65.336 | 1995 | 65.064 | 1994 | 64.496 | 1993 | 64.151 | 1992 | 63.897 | 1991 | 63.68 | 1990 | 63.202 | 1989 | 62.864 | 1988 | 62.428 | 1987 | 62.062 | 1986 | 61.744 | 1985 | 61.26 | 1984 | 60.751 | 1983 | 60.284 | 1982 | 59.718 | 1981 | 59.371 | 1980 | 58.831 | 1979 | 58.294 | 1978 | 57.761 | 1977 | 57.152 | 1976 | 56.556 | 1975 | 55.95 | 1974 | 51.636 | 1973 | 52.992 | 1972 | 53.914 | 1971 | 53.305 | 1970 | 52.756 | 1969 | 52.212 | 1968 | 51.692 | 1967 | 50.918 | 1966 | 50.366 | 1965 | 49.716 | 1964 | 48.985 | 1963 | 48.554 | 1962 | 47.97 | 1961 | 46.991 | 1960 | 46.504 |
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