Year	%
2004	11.9
2005	12.5
2006	12.5
2007	12.4
2008	12.2
2009	11.8
2010	12.5
2011	12.8
2012	12.2
2013	12
2014	11.6
2015	11.6
2016	11.4
2017	11.6
2018	12
2019	12
2020	11.9
2021	11.7