Year | Value | 2021 | 11.9 | 2020 | 12.19 | 2019 | 12.18 | 2018 | 12.47 | 2017 | 12.73 | 2016 | 12.58 | 2015 | 12.48 | 2014 | 12.58 | 2013 | 12.17 | 2012 | 11.17 | 2011 | 11.35 | 2010 | 11.47 | 2009 | 11.65 | 2008 | 11.16 | 2007 | 11.49 | 2006 | 10.62 | 2005 | 10.6 | 2004 | 11.85 | 2003 | 14.73 | 2002 | 14.78 | 2001 | 13.23 | 2000 | 15.22 | 1999 | 15.17 | 1998 | 16.73 | 1997 | 14.44 | 1996 | 14.45 | 1995 | 12.7 | 1993 | 13.15 | 1992 | 14.18 |
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