Year	% of population
2008	19.4401454907437
2009	18.9006744223216
2010	24.0775692141992
2011	18.7073337370459
2012	22.4222869447603
2013	23.8356525349304
2014	27.0079903110153
2015	27.0229757810327
2016	32.7720727817272
2017	36.6547726868914
2018	29.8773895544369
2019	29.8974706791198