Year | Value | 2021 | 69.63 | 2020 | 69.867 | 2019 | 69.496 | 2018 | 70.017 | 2017 | 69.63 | 2016 | 68.501 | 2015 | 68.5 | 2014 | 68.237 | 2013 | 69.983 | 2012 | 69.774 | 2011 | 66.833 | 2010 | 70.182 | 2009 | 70.186 | 2008 | 70.07 | 2007 | 69.819 | 2006 | 69.658 | 2005 | 69.545 | 2004 | 69.46 | 2003 | 69.145 | 2002 | 68.962 | 2001 | 68.912 | 2000 | 68.816 | 1999 | 69.287 | 1998 | 69.189 | 1997 | 69.342 | 1996 | 69.487 | 1995 | 69.25 | 1994 | 68.705 | 1993 | 68.524 | 1992 | 68.288 | 1991 | 67.715 | 1990 | 67.372 | 1989 | 66.812 | 1988 | 66.534 | 1987 | 65.975 | 1986 | 65.645 | 1985 | 65.031 | 1984 | 64.659 | 1983 | 64.069 | 1982 | 63.417 | 1981 | 63.064 | 1980 | 62.635 | 1979 | 62.103 | 1978 | 61.517 | 1977 | 60.85 | 1976 | 60.263 | 1975 | 59.115 | 1974 | 58.132 | 1973 | 56.807 | 1972 | 56.023 | 1971 | 54.904 | 1970 | 53.756 | 1969 | 52.644 | 1968 | 51.242 | 1967 | 50.032 | 1966 | 48.824 | 1965 | 47.403 | 1964 | 45.965 | 1963 | 44.205 | 1962 | 42.656 | 1961 | 40.986 | 1960 | 39.21 |
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