Year	%
2004	17
2005	15.4
2006	14
2007	12.9
2008	12.4
2009	12.9
2010	12.4
2011	13
2012	13.3
2013	13.4
2014	13.3
2015	12.9
2016	9.9
2017	9.4
2018	9.5
2019	8.8
2020	9.2
2021	8.7