Year	% (national estimate)
1960	68.49444130393819
1989	93.876731580004
1990	89.05080740448994
1991	88.84454200758333
1992	89.77850030481609
1993	75.16971816498663
1995	67.5103734439834
1996	65.3486394557823
1997	58.6021505376344
1998	59.675236806495256
1999	60.27777777777777
2000	65.33923303834808
2002	69.23293059848271
2003	63.36287313432835
2004	64.41558441558442
2005	65.311004784689
2006	65.71222329162656
2007	60.08802067995157
2008	74.2970123022847
2009	71.29300485301846
2010	73.25392359157131
2011	77.71920992626374
2012	74.82038634170254
2013	71.2640882186005
2014	69.43672644607224
2015	73.32533088063354
2016	76.66209362909068
2017	74.50995129577296
2018	76.11829615567157
2019	77.83371606901018