Year	%
2004	10.2
2005	12.9
2006	9.6
2007	9.6
2008	9.9
2009	10.2
2010	11.4
2011	11.7
2012	12.7
2013	12.7
2014	12.7
2015	12.5
2016	10.2
2017	11.5
2018	10.9
2019	9.3
2020	10
2021	7.7