Year | Value | 2018 | 45.1 | 2017 | 44.8 | 2016 | 44.4 | 2015 | 43.9 | 2014 | 44.4 | 2013 | 44.3 | 2012 | 44 | 2011 | 44.1 | 2010 | 45.5 | 2009 | 46.9 | 2008 | 48.6 | 2007 | 49.5 | 2006 | 50.1 | 2005 | 50.6 | 2004 | 51.1 | 2003 | 54.8 | 2001 | 54 | 2000 | 54.1 | 1999 | 55.9 | 1998 | 57 | 1997 | 60.2 | 1996 | 61.7 | 1995 | 63.4 | 1994 | 63.1 | 1993 | 63.3 | 1992 | 63.8 | 1991 | 65 | 1990 | 63.2 | 1989 | 66.5 | 1988 | 65.9 | 1987 | 66.1 | 1986 | 65.2 | 1985 | 64.6 |
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