Year | Value | 2021 | 13.05 | 2020 | 14.44 | 2019 | 11.9 | 2018 | 10.94 | 2017 | 11.88 | 2016 | 11.2 | 2015 | 11.82 | 2014 | 11.03 | 2013 | 11.65 | 2012 | 11.84 | 2011 | 11.83 | 2010 | 13.07 | 2009 | 12.22 | 2008 | 12.24 | 2007 | 11.83 | 2006 | 12.32 | 2005 | 12.66 | 2004 | 12.5 | 2003 | 13.34 | 2002 | 13.62 | 2001 | 13.38 | 2000 | 13.24 | 1999 | 13.3 | 1998 | 13 | 1997 | 12.82 | 1995 | 12.8 | 1992 | 17.13 |
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