Year	% (national estimate)
1979	67.963
1980	69.22
1981	70.7
1982	67.675
1983	61.758
1984	62.503
1985	63.818
1986	64.34
1987	63.572
1988	64.672
1989	67.363
1990	65.314
1991	59.087
1992	57.218
1993	57.523
1994	60.232
1995	62.22
1996	61.676
1997	60.251
1998	61.033
1999	61.955
2000	62.597
2001	61.692
2002	61.793
2003	62.398
2004	62.742
2005	64.175
2006	64.467
2007	64.986
2008	65.478
2009	61.62
2010	61.292
2011	60.571
2012	59.732
2013	58.58
2014	57.439
2015	58.146
2016	57.912
2017	58.212
2018	59.405
2019	59.503
2020	55.902
2021	59.531
2022	64.201
2023	64.415