Year | Value | 2023 | 70.095 | 2022 | 69.919 | 2021 | 69.757 | 2020 | 69.608 | 2019 | 69.473 | 2018 | 69.352 | 2017 | 69.246 | 2016 | 69.154 | 2015 | 69.061 | 2014 | 68.968 | 2013 | 68.875 | 2012 | 68.782 | 2011 | 68.689 | 2010 | 68.596 | 2009 | 68.502 | 2008 | 68.325 | 2007 | 68.147 | 2006 | 67.969 | 2005 | 67.79 | 2004 | 67.597 | 2003 | 67.427 | 2002 | 67.283 | 2001 | 67.183 | 2000 | 67.145 | 1999 | 67.106 | 1998 | 67.067 | 1997 | 67.029 | 1996 | 66.99 | 1995 | 66.951 | 1994 | 66.912 | 1993 | 66.874 | 1992 | 66.835 | 1991 | 66.796 | 1990 | 66.757 | 1989 | 66.718 | 1988 | 66.399 | 1987 | 65.83 | 1986 | 65.258 | 1985 | 64.681 | 1984 | 64.1 | 1983 | 63.504 | 1982 | 62.904 | 1981 | 62.3 | 1980 | 61.693 | 1979 | 61.081 | 1978 | 60.434 | 1977 | 59.756 | 1976 | 59.075 | 1975 | 58.389 | 1974 | 57.7 |
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