Year	% (national estimate)
1962	48.33
1968	51.07
1975	46.1
1979	47.59
1980	47.05
1981	46.12
1982	46.28
1983	53.219
1984	52.015
1985	51.406
1986	51.282
1987	49.58
1988	46.415
1989	45.247
1990	44.569
1991	39.915
1992	39.48
1993	38.033
1994	36.393
1995	35.49
1996	34.963
1997	33.914
1998	33.947
1999	35.81
2000	35.481
2001	35.753
2002	36.888
2003	37.143
2004	36.695
2005	34.059
2006	34.116
2007	34.627
2008	34.732
2009	35.597
2010	35.017
2011	33.985
2012	33.375
2013	35.318
2014	34.38
2015	34.882
2016	34.915
2017	34.982
2018	35.671
2019	34.885
2020	33.859
2021	37.974
2022	40.345
2023	42.507