Year	% (national estimate)
1976	58.64661654135338
1978	85.59090909090908
1979	83.68390470656595
1980	87.22241202596516
1982	89.15936753497895
1984	86.92631818699465
1987	87.32943469785576
1988	87.3387372987784
1989	87.12714075082226
1990	87.01950496178853
1994	77.72873672909459
1996	81.12956005332687
1997	82.01386355344764
1998	80.69422298540415
1999	79.95515136414602
2000	80.54865938430983
2001	79.86247544204323
2003	80.22696435179476
2004	79.6112944627796
2005	81.33971291866028
2006	80.11566383659408
2007	80.74191968658178
2008	80.6847465946742
2009	79.5228139220268
2010	79.62184873949579
2011	81.26772721667284
2012	80.42380189725267
2013	78.60037485436402
2014	78.19545050196976
2015	78.40085205764221
2016	78.2811727672416
2017	77.95235282535931
2018	77.95128453074773
2019	78.1577831938116
2020	78.47057419756851
2021	78.7349445640903
2022	78.79653520088463
2023	79.11478319889315