Year	% of population
2006	11.8
2007	12.4
2008	12.3
2009	12.6
2010	12.5
2011	12.5
2012	12.2
2013	11.4
2014	11.7
2015	10.7
2016	11.5
2017	10.9
2018	11.2
2019	10.9
2020	10.8