Year | Value | 2021 | 14.12 | 2020 | 13.69 | 2019 | 13.08 | 2018 | 12.56 | 2016 | 12.11 | 2015 | 11.96 | 2014 | 11.88 | 2013 | 11.72 | 2012 | 12.05 | 2011 | 12.41 | 2010 | 12.55 | 2009 | 12.17 | 2008 | 12.09 | 2007 | 12.13 | 2006 | 12.32 | 2005 | 12.42 | 2004 | 16.66 | 2002 | 16.84 | 2001 | 20.45 | 2000 | 20.9 | 1999 | 17.57 | 1994 | 31.23 |
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