Year	%
2004	9.8
2005	9.9
2006	10
2007	10
2008	10.2
2009	9.8
2010	9.7
2011	9.7
2012	9.4
2013	9.2
2014	9.4
2015	9.6
2016	9.7
2017	10
2018	10.1
2019	10.1
2020	10.3
2021	10.2