Year	% (national estimate)
1979	76.15
1980	76.26
1981	79.54
1982	77.5
1983	76.64
1984	77.59
1985	77.54
1986	78.01
1987	78.61
1988	78.47
1989	77.82
2009	65.22
2010	65.047
2011	65.682
2012	66.119
2013	66.568
2014	66.372
2015	66.463
2016	66.07
2017	66.048
2018	66.45
2019	65.174
2020	61.754
2021	61.716
2022	61.402
2023	61.37