Year	% (national estimate)
2006	49.44213180010791
2007	50.06907961106569
2008	48.69707242648459
2009	48.37117211992809
2010	47.880436408947986
2012	46.74400323835766
2014	44.96782473008288
2015	41.60499818330656
2016	42.39235473987452