Year | Value | 2022 | 5.6 | 2021 | 4.1 | 2020 | 5.2 | 2019 | 5.1 | 2018 | 5.8 | 2017 | 5.2 | 2016 | 7.2 | 2015 | 7.1 | 2014 | 7.6 | 2013 | 6.8 | 2012 | 10.2 | 2011 | 12.9 | 2010 | 13.5 | 2009 | 14.6 | 2008 | 14.2 | 2007 | 16.7 | 2006 | 19.5 | 2005 | 15 | 2004 | 17.3 | 2003 | 20 | 2002 | 27.2 | 2001 | 18.4 | 1999 | 20.4 | 1997 | 20.4 | 1995 | 23.5 | 1990 | 4.7 |
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