Year	% (national estimate)
1990	34.49
1992	29.66
1993	30.97
1994	28.61
1995	29.04
1999	26.25
2009	42.86
2010	41.67
2011	43.22
2012	43.78
2013	43.03
2014	44.47
2015	42.19
2016	40.305