Year	%
2004	16.1
2005	14.4
2006	11.9
2007	13.1
2008	13.6
2009	16.1
2010	15.6
2011	13.9
2012	14.1
2013	13
2014	15
2015	14.7
2016	15
2017	13.5
2018	13.2
2019	12.1
2020	10.4
2021	11.2