Year	% of population
2005	11.2
2006	11.3
2007	8
2008	4.9
2009	6.8
2010	6.6
2011	9.3
2012	25.2
2013	24.1
2014	24.4
2015	24
2016	23.6
2017	23.8
2018	24.5
2019	22.6
2020	21.2