Year | Value | 2021 | 67.134 | 2020 | 67.885 | 2019 | 68.627 | 2018 | 68.601 | 2017 | 68.962 | 2016 | 68.941 | 2015 | 68.899 | 2014 | 69.442 | 2013 | 69.528 | 2012 | 69.414 | 2011 | 69.49 | 2010 | 69.397 | 2009 | 69.317 | 2008 | 68.867 | 2007 | 68.584 | 2006 | 68.028 | 2005 | 67.411 | 2004 | 66.849 | 2003 | 66.514 | 2002 | 65.855 | 2001 | 65.166 | 2000 | 64.552 | 1999 | 63.921 | 1998 | 63.283 | 1997 | 62.999 | 1996 | 62.433 | 1995 | 62.3 | 1994 | 61.876 | 1993 | 61.701 | 1992 | 61.32 | 1991 | 61.054 | 1990 | 60.57 | 1989 | 60.139 | 1988 | 59.76 | 1987 | 59.071 | 1986 | 58.214 | 1985 | 57.718 | 1984 | 57.101 | 1983 | 56.128 | 1982 | 54.439 | 1981 | 53.892 | 1980 | 52.872 | 1979 | 51.643 | 1978 | 50.576 | 1977 | 49.526 | 1976 | 48.647 | 1975 | 47.554 | 1974 | 46.658 | 1973 | 45.724 | 1972 | 44.91 | 1971 | 43.934 | 1970 | 43.153 | 1969 | 42.157 | 1968 | 40.71 | 1967 | 39.891 | 1966 | 39.057 | 1965 | 38.249 | 1964 | 37.667 | 1963 | 36.568 | 1962 | 36.708 | 1961 | 36.736 | 1960 | 36.218 |
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