Year | Value | 2017 | 12 | 2016 | 10.202 | 2015 | 11.206 | 2014 | 10.207 | 2013 | 9.82 | 2012 | 10.97 | 2011 | 9.96 | 2010 | 9.96 | 2009 | 10.16 | 2008 | 11.33 | 2007 | 13.79 | 2006 | 12.27 | 2005 | 15.27 | 2004 | 17.65 | 2003 | 23.72 | 2002 | 25.9 | 2001 | 27.3 | 2000 | 29.77 | 1997 | 25.43 | 1995 | 31.84 | 1994 | 27.74 | 1993 | 26.23 | 1992 | 24.38 | 1991 | 20.6 | 1990 | 21.26 | 1989 | 17.64 |
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