Year | Value | 2020 | 11.734 | 2019 | 11.565 | 2018 | 12.667 | 2017 | 13.939 | 2016 | 16.604 | 2015 | 16.506 | 2014 | 17.439 | 2013 | 19.416 | 2012 | 19.653 | 2011 | 19.632 | 2010 | 20.203 | 2009 | 20.71 | 2008 | 17.87 | 2007 | 13.28 | 2006 | 13.57 | 2005 | 13.81 | 2004 | 12.62 | 2003 | 11.51 | 2002 | 12.59 | 2001 | 11.16 | 2000 | 10.82 | 1999 | 13.8 | 1998 | 14.53 | 1997 | 5 | 1996 | 2.4 |
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