Year | Value | 2023 | 78.187 | 2022 | 78.09 | 2021 | 74.145 | 2020 | 76.788 | 2019 | 74.176 | 2018 | 77.731 | 2017 | 77.725 | 2016 | 77.757 | 2015 | 77.443 | 2014 | 77.749 | 2013 | 77.586 | 2012 | 77.301 | 2011 | 77.151 | 2010 | 77.05 | 2009 | 77.061 | 2008 | 77.008 | 2007 | 76.939 | 2006 | 76.873 | 2005 | 76.767 | 2004 | 76.542 | 2003 | 76.538 | 2002 | 76.35 | 2001 | 76.121 | 2000 | 75.899 | 1999 | 75.666 | 1998 | 75.478 | 1997 | 75.332 | 1996 | 75.219 | 1995 | 75.147 | 1994 | 75.099 | 1993 | 75.046 | 1992 | 74.913 | 1991 | 74.826 | 1990 | 74.634 | 1989 | 74.433 | 1988 | 74.256 | 1987 | 74.147 | 1986 | 74.057 | 1985 | 73.972 | 1984 | 73.794 | 1983 | 73.536 | 1982 | 73.171 | 1981 | 72.837 | 1980 | 72.555 | 1979 | 72.34 | 1978 | 72.145 | 1977 | 71.938 | 1976 | 71.642 | 1975 | 71.217 |
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