Year	% of population
2008	17.1181765829115
2009	18.0738353389349
2010	16.3574936943255
2011	17.6171152988538
2012	17.9151723264753
2013	16.8433940668224
2014	17.5340216479609
2015	17.9642951857035
2016	18.1518965362549
2017	19.2684745017048
2018	22.5701965852027
2019	23.6676892929807