Year | Value | 2022 | 8.684 | 2021 | 10.061 | 2020 | 9.011 | 2019 | 10.395 | 2018 | 12.733 | 2017 | 13.477 | 2016 | 15.257 | 2015 | 17.66 | 2014 | 19.223 | 2013 | 22.154 | 2012 | 24 | 2011 | 22.959 | 2010 | 19.204 | 2009 | 16.116 | 2008 | 13.67 | 2007 | 18.06 | 2006 | 20.85 | 2005 | 20.85 | 2004 | 18.5 | 2003 | 15.2 | 2002 | 13.8 | 2001 | 12.8 | 2000 | 12.6 | 1999 | 13.7 | 1998 | 13.7 | 1997 | 13.8 | 1996 | 13.2 | 1995 | 13.4 |
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