Year	% of population
2004	14.8
2005	12.7
2006	11
2007	10.6
2008	10.7
2009	12.2
2010	12.4
2011	12.6
2012	12.8
2013	13.6
2014	13.1
2015	13.1
2016	12.1
2017	11.3
2018	11.6
2019	10.6
2020	12.4
2021	11.5