Year	% (national estimate)
2006	17.6352107176395
2007	16.007100511865023
2008	15.771582416805074
2009	14.994270853620872
2010	14.533276764830969
2012	13.561497082938832
2014	11.91817508622138
2015	15.111411558267132
2016	14.25272489883999