Year	% (national estimate)
1980	84.73
1981	80.21
1982	77.81
1985	70.13
1986	66.9
1987	67.52
1989	59.15
1990	70.297
1991	65.21
1992	70.647
1993	58.9
1994	61.8
1995	75.67
1997	46.13
1999	79.931
2000	84.21
2001	79.9
2002	80
2003	80.3
2004	80.3
2005	76.735
2006	79.216
2007	53.84
2008	80.506
2009	79.96
2011	80.804
2012	78.969
2013	78.71
2014	80.787
2015	77.812
2016	75.598
2017	75.781
2018	77.527
2019	79.429
2020	75.304
2021	80.849
2022	82.462