Year | Value | 2023 | 72.895 | 2022 | 72.635 | 2021 | 72.13 | 2020 | 72.379 | 2019 | 72.292 | 2018 | 72.169 | 2017 | 72.066 | 2016 | 71.951 | 2015 | 71.851 | 2014 | 71.721 | 2013 | 71.65 | 2012 | 71.546 | 2011 | 71.437 | 2010 | 71.319 | 2009 | 70.949 | 2008 | 71.041 | 2007 | 70.887 | 2006 | 70.71 | 2005 | 70.56 | 2004 | 70.433 | 2003 | 70.228 | 2002 | 70.03 | 2001 | 69.8 | 2000 | 69.635 | 1999 | 69.431 | 1998 | 69.224 | 1997 | 69.012 | 1996 | 68.803 | 1995 | 68.592 | 1994 | 68.371 | 1993 | 68.157 | 1992 | 67.927 | 1991 | 67.749 | 1990 | 67.539 | 1989 | 67.445 | 1988 | 67.321 | 1987 | 67.189 | 1986 | 67.058 | 1985 | 66.928 | 1984 | 66.806 | 1983 | 66.652 | 1982 | 66.327 | 1981 | 66.357 | 1980 | 66.186 | 1979 | 66.039 | 1978 | 65.854 | 1977 | 65.625 | 1976 | 65.418 | 1975 | 65.122 |
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