Year | Value | 2023 | 70.906 | 2022 | 70.883 | 2021 | 67.463 | 2020 | 69.35 | 2019 | 68.617 | 2018 | 70.468 | 2017 | 70.43 | 2016 | 70.425 | 2015 | 70.255 | 2014 | 70.407 | 2013 | 70.374 | 2012 | 70.219 | 2011 | 70.112 | 2010 | 69.99 | 2009 | 70.002 | 2008 | 70.035 | 2007 | 70.129 | 2006 | 70.177 | 2005 | 70.189 | 2004 | 70.055 | 2003 | 70.019 | 2002 | 69.834 | 2001 | 69.557 | 2000 | 69.233 | 1999 | 68.83 | 1998 | 68.446 | 1997 | 68.145 | 1996 | 68.01 | 1995 | 68 | 1994 | 68.052 | 1993 | 68.082 | 1992 | 67.978 | 1991 | 67.849 | 1990 | 67.587 | 1989 | 67.352 | 1988 | 67.122 | 1987 | 66.986 | 1986 | 66.935 | 1985 | 66.951 | 1984 | 66.916 | 1983 | 66.786 | 1982 | 66.511 | 1981 | 66.225 | 1980 | 65.962 | 1979 | 65.891 | 1978 | 65.878 | 1977 | 65.831 | 1976 | 65.639 | 1975 | 65.279 |
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