Year | Value | 2021 | 70.213 | 2020 | 70.133 | 2019 | 74.202 | 2018 | 74.015 | 2017 | 74.138 | 2016 | 74.412 | 2015 | 74.682 | 2014 | 74.797 | 2013 | 74.739 | 2012 | 74.574 | 2011 | 74.365 | 2010 | 74.19 | 2009 | 74.119 | 2008 | 74.152 | 2007 | 74.238 | 2006 | 74.331 | 2005 | 74.376 | 2004 | 74.372 | 2003 | 74.274 | 2002 | 74.106 | 2001 | 73.867 | 2000 | 73.569 | 1999 | 73.225 | 1998 | 72.845 | 1997 | 72.445 | 1996 | 72.037 | 1995 | 71.646 | 1994 | 71.279 | 1993 | 70.942 | 1992 | 70.616 | 1991 | 70.298 | 1990 | 69.971 | 1989 | 69.623 | 1988 | 69.253 | 1987 | 68.844 | 1986 | 68.388 | 1985 | 67.874 | 1984 | 67.29 | 1983 | 66.644 | 1982 | 65.975 | 1981 | 65.313 | 1980 | 64.703 | 1979 | 64.189 | 1978 | 63.778 | 1977 | 63.434 | 1976 | 63.123 | 1975 | 62.81 | 1974 | 62.459 | 1973 | 62.055 | 1972 | 61.614 | 1971 | 61.155 | 1970 | 60.69 | 1969 | 60.25 | 1968 | 59.835 | 1967 | 59.42 | 1966 | 58.981 | 1965 | 58.499 | 1964 | 57.947 | 1963 | 57.31 | 1962 | 56.599 | 1961 | 55.831 | 1960 | 55.017 |
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