Year | Value | 2022 | 75.473 | 2021 | 74.518 | 2020 | 74.954 | 2019 | 74.638 | 2018 | 74.315 | 2017 | 74.071 | 2016 | 73.688 | 2015 | 73.544 | 2014 | 73.27 | 2013 | 72.958 | 2012 | 72.68 | 2011 | 72.352 | 2010 | 72.092 | 2009 | 71.817 | 2008 | 71.45 | 2007 | 71.162 | 2006 | 70.952 | 2005 | 70.039 | 2004 | 69.33 | 2003 | 69.371 | 2002 | 69.13 | 2001 | 68.798 | 2000 | 68.434 | 1999 | 68.575 | 1998 | 68.746 | 1997 | 68.228 | 1996 | 67.205 | 1995 | 66.544 | 1994 | 67.121 | 1993 | 67.065 | 1992 | 67.03 | 1991 | 66.94 | 1990 | 66.759 | 1989 | 66.563 | 1988 | 66.226 | 1987 | 66.047 | 1986 | 64.941 | 1985 | 64.07 | 1984 | 63.193 | 1983 | 62.272 | 1982 | 61.534 | 1981 | 60.796 | 1980 | 60.242 | 1979 | 59.633 | 1978 | 59.344 | 1977 | 59.089 | 1976 | 58.772 | 1975 | 58.131 | 1974 | 57.52 |
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