Year | Value | 2021 | 9.88 | 2020 | 9.93 | 2019 | 9.94 | 2018 | 9.97 | 2017 | 10.02 | 2016 | 9.94 | 2015 | 9.81 | 2014 | 9.81 | 2013 | 9.84 | 2012 | 9.76 | 2011 | 9.8 | 2010 | 9.63 | 2009 | 9.57 | 2008 | 9.6 | 2007 | 9.52 | 2006 | 9.64 | 2005 | 9.87 | 2004 | 11.51 | 2002 | 14.65 | 2001 | 13.13 | 2000 | 13.27 | 1999 | 15.48 | 1998 | 15.39 | 1997 | 13.2 | 1996 | 13.01 | 1995 | 12.65 | 1992 | 6.95 |
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