Year	% (national estimate)
1960	63.26
1965	61.32
1970	58.1
1974	58.31
1976	57.42
1977	58.05
1978	57.93
1979	56.83
1981	66.02
1983	62.208
1984	71.318
1985	72.191
1986	71.65
1987	74.744
1988	73.282
1989	71.318
1990	70.372
1991	70.893
1992	71.024
1993	70.013
1994	65.853
1995	69.444
1996	70.769
1997	70.413
1998	71.584
1999	70.112
2000	68.756
2001	65.019
2002	67.038
2003	63.61
2004	63.914
2005	66.224
2006	69.313
2007	69.138
2008	68.212
2009	67.192
2010	63.93
2011	63.316
2012	60.949
2013	59.005
2014	58.806
2015	58.868
2016	61.221
2017	61.227
2018	60.813
2019	61.783
2020	60.367
2021	59.935
2022	62.885
2023	65.562