Year | Value | 2023 | 74.316403078712 | 2022 | 72.281885474262 | 2021 | 70.464815665779 | 2020 | 70.842487378595 | 2019 | 65.943159801658 | 2018 | 65.062479910181 | 2017 | 65.229267030391 | 2016 | 66.87463764545 | 2015 | 68.46585435421 | 2014 | 69.512575070081 | 2013 | 68.915734519082 | 2012 | 69.621379743314 | 2011 | 69.102723592113 | 2010 | 67.976345617125 | 2009 | 69.045832100848 | 2008 | 67.981346108537 | 2007 | 66.474348966611 | 2006 | 67.95342119009 | 2005 | 69.493503831091 | 2004 | 68.988545474572 | 2003 | 68.556819262904 | 2002 | 68.829869359596 | 2001 | 69.4772928948 | 2000 | 67.709701725111 | 1999 | 66.757665100987 | 1998 | 64.739608380465 | 1997 | 65.084506115309 | 1996 | 63.293202006466 | 1995 | 62.551527949215 | 1994 | 63.183169833211 | 1993 | 62.960704486635 | 1992 | 64.668159549045 | 1991 | 64.197178536275 | 1990 | 65.963148198933 | 1989 | 65.017025744391 | 1988 | 66.785186434751 | 1987 | 71.411549272684 | 1986 | 74.144186696459 | 1985 | 75.748980818787 | 1984 | 76.820163078259 | 1983 | 77.974546258426 | 1982 | 76.661330510493 | 1981 | 78.045545854118 | 1980 | 77.740678976585 | 1979 | 77.084632399984 | 1978 | 75.699711402588 | 1977 | 78.01437279478 | 1976 | 79.559594604902 | 1975 | 79.980880869505 | 1974 | 77.442691717764 |
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