Year	% of population
2008	16.8251380299663
2010	21.532412463307
2011	22.6656428411508
2012	22.3794439732366
2014	19.6788519395157
2015	20.9274762527533
2016	20.9318039761449
2017	23.6802026255235
2018	27.756913980935
2019	28.4218160518767
2020	30.7304173283799