Year | Value | 2021 | 11.33 | 2020 | 11.83 | 2019 | 11.83 | 2018 | 13.13 | 2017 | 13.31 | 2016 | 12.08 | 2015 | 11.84 | 2014 | 12.87 | 2013 | 12.88 | 2012 | 13.14 | 2011 | 13.66 | 2010 | 13.53 | 2009 | 13.84 | 2008 | 13.85 | 2007 | 13.85 | 2006 | 14.15 | 2005 | 14.61 | 2004 | 14.56 | 2003 | 14.55 | 2002 | 14.23 | 2001 | 14.27 | 2000 | 14.35 | 1999 | 15.46 | 1997 | 15.56 | 1996 | 15.22 |
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