Year | Value | 2021 | 9.86 | 2020 | 9.42 | 2019 | 10.21 | 2018 | 9.03 | 2017 | 8.88 | 2016 | 8.91 | 2015 | 9.75 | 2013 | 10.59 | 2012 | 10.71 | 2011 | 10.56 | 2010 | 8.88 | 2009 | 10.28 | 2008 | 9.98 | 2007 | 14.66 | 2006 | 13.86 | 2005 | 16.5 | 2004 | 28.57 | 2003 | 25.63 | 2002 | 28.79 | 2001 | 31.79 | 2000 | 33.4 | 1999 | 32.4 | 1997 | 28.9 | 1996 | 37 | 1992 | 56.02 | 1990 | 80.85 |
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