Year	% (national estimate)
1979	59.42
1980	60.23
1981	63.58
1982	62.1
1983	61.58
1984	62.73
1985	62.78
1986	63.21
1987	63.45
1988	63.24
1989	62.28
2009	57.58
2010	57.01
2011	58.018
2012	58.514
2013	59.135
2014	59.045
2015	59.117
2016	58.981
2017	59.211
2018	59.556
2019	58.902
2020	56.245
2021	56.303
2022	55.699
2023	55.638