Year | Value | 2017 | 5.05 | 2016 | 5.28 | 2015 | 5.11 | 2014 | 5.03 | 2013 | 5.46 | 2012 | 6.2 | 2011 | 8.32 | 2010 | 9.94 | 2009 | 8.37 | 2008 | 9.37 | 2007 | 7.25 | 2006 | 8.84 | 2005 | 8.17 | 2004 | 9.49 | 2003 | 12.47 | 2002 | 15.52 | 2001 | 15.06 | 2000 | 18.61 | 1999 | 15.23 | 1998 | 25.03 | 1997 | 15.47 | 1996 | 26.57 | 1995 | 27.19 | 1994 | 12.32 | 1993 | 30.15 | 1992 | 21.31 | 1990 | 28.07 |
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