Year	% (national estimate)
2008	25.664661715678097
2009	25.008336188016028
2010	23.706756269899547
2011	22.301475097312697
2012	22.210375733175418
2014	21.52135748595777
2015	20.46463629263899
2016	20.703478925291492
2017	19.97430193280211