Year	% of population
2008	16.6249563670881
2009	17.885800689153
2010	18.2735924313158
2011	16.5331288880983
2012	19.274389649097
2013	21.8712642001387
2014	23.2879783218371
2015	25.5571781570142
2016	25.561321466287
2017	31.2126567999845
2018	25.26728671999
2019	22.9139018911515