Year	% of population
2004	31.072089024791
2005	32.7244701007241
2006	33.4229985960713
2007	38.0484117129049
2008	40.7771327457982
2009	22.5170420231389
2010	20.2874086556136
2011	21.8534404917199
2012	18.3592403782426
2013	19.0006447304941
2014	20.5068329158065
2015	20.0340169954359
2016	20.0856781523736
2017	20.6916285760851
2018	19.1319282470799
2019	16.9301647938291