Year	%
2006	13.8
2007	13.4
2008	13.4
2009	13.2
2010	13.4
2011	13.5
2012	13.5
2013	13.6
2014	13.5
2015	13.4
2016	13.4
2017	13.4
2018	13.6
2019	13.1
2020	13