Year	% (national estimate)
1960	27.003257328990234
1991	71.48688046647231
1994	77.54707870593916
1997	76.95587994095457
2000	76.55016910935738
2001	82.12085899783585
2004	72.27635075287864
2008	81.0064935064935
2010	83.47446715040977
2012	85.05561334720333
2013	89.9093961274893
2014	88.28231082582396
2016	84.27049714380956
2018	88.3914187734269