Year	%
2004	13
2005	12.9
2006	12.8
2007	12.6
2008	12.5
2009	12.5
2010	12.8
2011	12.5
2012	12.1
2013	11.4
2014	11.8
2015	12.1
2016	12.4
2017	12.9
2018	12.5
2019	12.8
2020	12.8
2021	12.8