Year | Value | 2022 | 77.843 | 2021 | 75.096 | 2020 | 76.27 | 2019 | 73.83 | 2018 | 77.32 | 2017 | 77.17 | 2016 | 76.938 | 2015 | 76.372 | 2014 | 76.639 | 2013 | 76.295 | 2012 | 75.922 | 2011 | 75.762 | 2010 | 76.149 | 2009 | 76.071 | 2008 | 75.962 | 2007 | 75.87 | 2006 | 76.176 | 2005 | 76.028 | 2004 | 75.705 | 2003 | 75.666 | 2002 | 75.483 | 2001 | 75.371 | 2000 | 75.187 | 1999 | 74.904 | 1998 | 74.671 | 1997 | 74.424 | 1996 | 73.989 | 1995 | 74.038 | 1994 | 74.025 | 1993 | 73.9 | 1992 | 73.859 | 1991 | 73.592 | 1990 | 73.383 | 1989 | 72.842 | 1988 | 72.681 | 1987 | 72.433 | 1986 | 72.885 | 1985 | 72.89 | 1984 | 72.77 | 1983 | 72.237 | 1982 | 71.777 | 1981 | 71.262 | 1980 | 70.994 | 1979 | 70.911 | 1978 | 71.186 | 1977 | 71.142 | 1976 | 70.904 | 1975 | 70.499 | 1974 | 70.207 |
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