Year | Value | 2021 | 12.13 | 2020 | 12.13 | 2019 | 12.13 | 2018 | 12.51 | 2017 | 12.84 | 2016 | 12.19 | 2015 | 12.55 | 2014 | 12.91 | 2013 | 12.88 | 2012 | 12.88 | 2011 | 12.94 | 2010 | 13.02 | 2009 | 13.13 | 2008 | 13.22 | 2007 | 13.22 | 2006 | 13.45 | 2005 | 13.64 | 2004 | 13.62 | 2003 | 13.59 | 2002 | 13.59 | 2001 | 13.42 | 1996 | 4.81 | 1993 | 4.88 |
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