Year | Value | 2019 | 17.153 | 2018 | 15.459 | 2017 | 15.33 | 2016 | 15.557 | 2015 | 15.159 | 2014 | 14.259 | 2013 | 15.934 | 2012 | 17.63 | 2011 | 18.334 | 2010 | 13.049 | 2009 | 13.291 | 2008 | 12.444 | 2007 | 12.365 | 2006 | 12.51 | 2005 | 12.872 | 2004 | 14.23 | 2003 | 14.51 | 2002 | 14.55 | 2001 | 14.4 | 2000 | 14.94 | 1999 | 15.21 | 1997 | 15.94 | 1989 | 16.13 |
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