Year	%
2003	13.6
2004	12.8
2005	11.5
2006	11.5
2007	12.2
2008	11.9
2009	12.2
2010	11.9
2011	11.7
2012	13.6
2013	14.4
2014	14.2
2015	13.2
2016	12.5
2017	11
2018	11.5
2019	11.2
2020	12.3
2021	10.5