Year	% (national estimate)
2008	25.507459459440195
2009	24.881968642833108
2010	23.58848805630524
2011	22.234798782004393
2012	22.14004874051175
2014	21.465021186729356
2015	20.44198153841313
2016	20.674339025606194
2017	19.942455472066264