Year	% of population
2000	13.0199128083814
2001	13.4428760410157
2002	13.8597664884199
2003	14.2731777375881
2004	14.6839271235891
2005	15.0918880452081
2006	15.4972904991899
2007	16.1325412842487
2008	16.7766010280984
2009	17.4292475061405
2010	18.0905259416666
2011	18.7604753493573
2012	19.4390128107847
2013	20.1229118595197
2014	20.8135647837325
2015	21.5130112260966
2016	22.2212900255231
2017	22.9382712895571