Year | Value | 2022 | 6.143 | 2021 | 6.894 | 2020 | 6.719 | 2019 | 5.761 | 2018 | 6.544 | 2017 | 8.142 | 2016 | 9.679 | 2015 | 11.492 | 2014 | 11.537 | 2013 | 14.227 | 2012 | 13.966 | 2011 | 13.634 | 2010 | 14.387 | 2009 | 12.023 | 2008 | 9.514 | 2007 | 11.16 | 2006 | 13.395 | 2005 | 16.276 | 2004 | 18.206 | 2003 | 17.55 | 2002 | 18.541 | 2001 | 20.46 | 2000 | 18.546 | 1999 | 16.099 | 1998 | 12.421 | 1997 | 11.894 | 1996 | 11.341 | 1995 | 13.109 | 1994 | 13.654 | 1993 | 12.2 |
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