Year | Value | 2021 | 67.935 | 2020 | 68.667 | 2019 | 69.049 | 2018 | 68.875 | 2017 | 68.712 | 2016 | 68.233 | 2015 | 67.967 | 2014 | 67.773 | 2013 | 67.398 | 2012 | 67.513 | 2011 | 67.253 | 2010 | 67.096 | 2009 | 66.951 | 2008 | 66.785 | 2007 | 66.623 | 2006 | 66.525 | 2005 | 66.38 | 2004 | 66.336 | 2003 | 66.159 | 2002 | 66.383 | 2001 | 66.168 | 2000 | 65.897 | 1999 | 65.81 | 1998 | 65.528 | 1997 | 65.104 | 1996 | 64.68 | 1995 | 64.263 | 1994 | 63.876 | 1993 | 63.714 | 1992 | 63.228 | 1991 | 62.912 | 1990 | 62.227 | 1989 | 61.831 | 1988 | 60.984 | 1987 | 60.27 | 1986 | 59.358 | 1985 | 58.63 | 1984 | 57.83 | 1983 | 56.885 | 1982 | 55.995 | 1981 | 55.273 | 1980 | 54.586 | 1979 | 53.698 | 1978 | 52.864 | 1977 | 51.953 | 1976 | 51.157 | 1975 | 50.437 | 1974 | 49.752 | 1973 | 48.54 | 1972 | 48.743 | 1971 | 48.361 | 1970 | 47.897 | 1969 | 47.679 | 1968 | 47.939 | 1967 | 47.438 | 1966 | 47.608 | 1965 | 47.33 | 1964 | 46.658 | 1963 | 45.88 | 1962 | 45.072 | 1961 | 44.274 | 1960 | 43.555 |
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