Year	%
2006	12.6
2007	11.9
2008	12.6
2009	12.5
2010	12.1
2011	12.7
2012	12.2
2013	12.2
2014	11.8
2015	11.6
2016	11
2017	11
2018	10.8
2019	11
2020	10.9
2021	11