Year | Value | 2022 | 6.4 | 2021 | 6.7 | 2020 | 7.2 | 2019 | 5.1 | 2018 | 4.9 | 2017 | 4.6 | 2016 | 5.6 | 2015 | 6 | 2014 | 6.3 | 2013 | 7.4 | 2012 | 7.8 | 2011 | 8.5 | 2010 | 12 | 2009 | 13.6 | 2008 | 14.7 | 2007 | 19.6 | 2006 | 22.3 | 2005 | 22.7 | 2004 | 25.1 | 2003 | 24.5 | 2002 | 18.5 | 2001 | 14.1 | 2000 | 12.5 | 1998 | 11.8 | 1997 | 11.9 | 1996 | 11.6 | 1995 | 11 | 1992 | 11.1 | 1989 | 13.6 | 1981 | 17.3 |
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