Year	% (national estimate)
1960	54.97845065753122
1970	45.23484942372041
1974	71.96904557179708
1975	76.09468907150742
1976	75.66699604743083
1978	80.29735132433782
1980	59.86968754627573
1981	81.76573865061451
1982	81.62288239626811
1985	61.902580546648345
1988	68.56767794632438
1990	81.13379274476661
1991	56.91659401336822
1994	84.27664460353911
1995	80.46875
1996	80.26490066225166
1997	79.08847184986595
1998	78.26382285015623
1999	77.3972602739726
2001	73.42465753424658
2002	76.27586206896552
2003	74.25049033342674
2004	75.03392130257801
2007	77.55102040816327
2008	74.73171125802847
2009	74.53822740476159
2010	74.69026295459098
2011	74.80221462395743
2012	75.98058336583887
2013	76.37639516583161
2014	76.25283593233968
2015	80.06092179804708
2016	79.4447357605476
2017	80.24780209700407
2018	80.07941477854949
2019	80.55800540366496
2020	79.91081092782613
2021	80.1341360522816
2022	82.09985935302392