Year	%
2004	12.6
2005	14.1
2006	11.1
2007	13.9
2008	15.1
2009	15.5
2010	16.1
2011	14.6
2012	14.3
2013	13.8
2014	13.3
2015	11.7
2016	12.5
2017	12.8
2018	11.9
2019	11.9
2020	12.2
2021	12.3