Year	%
2006	8.6
2007	8.3
2008	8.5
2009	8.2
2010	8.4
2011	8.5
2012	8.4
2013	8.6
2014	8.6
2015	8.5
2016	8.6
2017	8.5
2018	8.6
2019	8.1
2020	8