Year	% of population
2008	22.6183414043584
2009	25.7687406026736
2010	25.4372104272967
2011	23.8684474674783
2012	22.4985882895512
2013	20.4078931361889
2014	23.9620841610097
2015	25.0145895503117
2016	23.9365211306572
2017	25.3990021584862
2018	27.6308827507943
2019	30.0938649425768