Year | Value | 2019 | 53.8 | 2018 | 54.2 | 2017 | 55.3 | 2016 | 56.5 | 2015 | 57.3 | 2014 | 57.7 | 2013 | 58.7 | 2012 | 60 | 2011 | 61 | 2010 | 62.3 | 2009 | 63.6 | 2008 | 64.8 | 2007 | 66.6 | 2006 | 68.4 | 2005 | 69.9 | 2004 | 71.6 | 2003 | 74.1 | 2002 | 75.3 | 2001 | 75.7 | 2000 | 75.9 | 1999 | 76 | 1998 | 75.6 | 1997 | 75.7 | 1996 | 76.1 | 1995 | 77 | 1994 | 77.4 | 1993 | 78.2 | 1992 | 77.8 | 1991 | 78.4 | 1990 | 78.7 | 1989 | 78.6 |
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