Year | Value | 2022 | 6.815 | 2021 | 7.513 | 2020 | 8.098 | 2019 | 6.312 | 2018 | 7.412 | 2017 | 8.715 | 2016 | 9.643 | 2015 | 9.873 | 2014 | 10.846 | 2013 | 11.867 | 2012 | 15.047 | 2011 | 16.206 | 2010 | 19.482 | 2009 | 17.515 | 2008 | 7.739 | 2007 | 6.052 | 2006 | 7.03 | 2005 | 10.033 | 2004 | 11.708 | 2003 | 12.061 | 2002 | 13.829 | 2001 | 13.821 | 2000 | 14.211 | 1999 | 13.79 | 1998 | 14.454 | 1997 | 14.9 | 1996 | 20.93 |
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