Year | Value | 2017 | 7.36 | 2016 | 7.52 | 2015 | 7.15 | 2014 | 7.42 | 2013 | 9 | 2012 | 9.88 | 2011 | 13.82 | 2010 | 14.15 | 2009 | 12.6 | 2008 | 15.33 | 2007 | 13.09 | 2006 | 13.67 | 2005 | 14.53 | 2004 | 16.74 | 2003 | 22.23 | 2002 | 25.18 | 2001 | 20.64 | 2000 | 25.23 | 1999 | 21.07 | 1998 | 25.03 | 1997 | 22.4 | 1996 | 26.57 | 1995 | 27.19 | 1993 | 44.42 | 1992 | 28.46 | 1990 | 28.07 |
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