Year | Value | 2017 | 10.96 | 2016 | 10.87 | 2015 | 12.09 | 2014 | 11.16 | 2013 | 11.55 | 2012 | 12.16 | 2011 | 12.32 | 2010 | 12.78 | 2009 | 12.14 | 2008 | 13.37 | 2007 | 13.08 | 2006 | 13.18 | 2005 | 13.87 | 2004 | 11.07 | 2003 | 12.88 | 2002 | 13.68 | 2001 | 12.94 | 2000 | 13.41 | 1999 | 20.09 | 1998 | 17.13 | 1997 | 20.18 | 1996 | 24.03 | 1995 | 15.2 | 1994 | 21.78 | 1993 | 18.05 |
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