Year | Value | 2021 | 12.39 | 2020 | 12.39 | 2019 | 12.39 | 2018 | 12.23 | 2017 | 11.64 | 2016 | 12.3 | 2015 | 12.38 | 2014 | 12.32 | 2013 | 12.51 | 2012 | 12.71 | 2011 | 14.47 | 2010 | 14.47 | 2009 | 13.92 | 2008 | 11.93 | 2007 | 11.61 | 2006 | 11.43 | 2005 | 13.93 | 2004 | 13.93 | 2003 | 13.97 | 2002 | 13.55 | 2001 | 13.55 | 2000 | 16.35 | 1999 | 19.58 | 1996 | 22.82 |
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