Year	% of population
2008	13.0693775815589
2009	20.1366883477874
2010	13.5661379165701
2011	13.6283597135488
2012	14.1566647103463
2014	15.1029348823954
2015	16.5151453804954
2016	17.6304929677278
2017	17.9183086244892
2018	17.8151882806142
2019	19.0961840533965
2020	21.1755186053728