Year | Value | 2019 | 63.9 | 2018 | 64.2 | 2017 | 64.8 | 2016 | 65.4 | 2015 | 65.7 | 2014 | 65.8 | 2013 | 66.6 | 2012 | 67.4 | 2011 | 68.2 | 2010 | 69 | 2009 | 70.2 | 2008 | 70.6 | 2007 | 71.6 | 2006 | 72.4 | 2005 | 73.7 | 2004 | 74.9 | 2003 | 76.6 | 2002 | 76.9 | 2001 | 77.2 | 2000 | 77.6 | 1999 | 77.6 | 1998 | 77.4 | 1997 | 77.2 | 1996 | 77.3 | 1995 | 77.6 | 1994 | 77.9 | 1993 | 77.7 | 1992 | 76.5 | 1991 | 75.8 | 1990 | 75.1 |
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