Year	%
2003	13.5
2004	11.3
2005	10.7
2006	10.2
2007	9.3
2008	10
2009	10.7
2010	12.5
2011	11
2012	10.8
2013	11.9
2014	10.8
2015	10.6
2016	9.8
2017	9.6
2018	9.9
2019	9.3
2020	9.2
2021	8.7