Year | Value | 2021 | 13.1 | 2020 | 12.1 | 2019 | 20.2 | 2018 | 12.79 | 2016 | 12.65 | 2015 | 12.63 | 2014 | 12.66 | 2013 | 11.82 | 2012 | 12.85 | 2011 | 13.15 | 2010 | 12.98 | 2009 | 12.77 | 2008 | 15.07 | 2007 | 13.05 | 2006 | 13.11 | 2005 | 14.72 | 2004 | 14.82 | 2003 | 14.87 | 2002 | 14.66 | 2000 | 14.41 | 1999 | 14.36 | 1998 | 21.67 | 1993 | 20.87 |
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