Year	% of population
2009	46.9895764554767
2010	47.1855146533784
2011	47.383470228783
2012	47.5834496593162
2013	47.7857869906657
2014	47.9898041580642
2015	48.1958423695903
2016	48.4035635896022
2017	48.6129682596557