Year	% of population
2003	11
2004	11.7
2005	12.6
2006	13
2007	13.6
2008	13.8
2009	13.1
2010	13.7
2011	13.2
2012	11.8
2013	12.8
2014	12.4
2015	11.6
2016	11.5
2017	12
2018	11.6
2019	12.2
2020	10.8
2021	12.7
2022	12.2