Year | Value | 2019 | 49.5 | 2018 | 51.3 | 2017 | 51.2 | 2016 | 50.5 | 2015 | 53.2 | 2014 | 53.1 | 2013 | 54.4 | 2012 | 56.9 | 2011 | 51.4 | 2010 | 51.3 | 2009 | 48.4 | 2008 | 51.3 | 2007 | 54.2 | 2006 | 56.4 | 2005 | 62 | 2004 | 64.5 | 2003 | 65 | 2002 | 61.5 | 2001 | 56.5 | 1999 | 66.2 | 1998 | 64.7 | 1997 | 65.6 | 1996 | 72.9 | 1995 | 71 | 1994 | 70 | 1993 | 70.1 | 1992 | 76.4 | 1991 | 79.4 | 1990 | 82.6 | 1989 | 80.6 |
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