Year	% (national estimate)
2006	49.29985674790504
2007	49.95127559162194
2008	48.57787366018778
2009	48.26324864170229
2010	47.78531501213377
2012	46.74382940632335
2014	44.998673097098404
2015	41.775856683408925
2016	42.52635944421522