Year	% (national estimate)
1983	51.25290502343499
1984	53.64422935565339
1985	53.02597661246351
1986	52.925663536069834
1987	53.458329159569146
1988	51.79774656835967
1989	52.1044421016902
1990	51.82861938753535
1991	50.60065182708636
1992	48.57071614774637
1993	46.096333421368485
1994	45.0006806203682
1995	44.3633964644787
1996	43.18116257745012
1997	42.10075128632601
1998	42.74990937022439
1999	43.09794933660237
2000	43.008777074901964
2001	42.90823841981793
2002	42.4427987895848
2003	41.72157867036134
2004	41.3920900864979
2005	40.9394660144313
2006	40.87751454029396
2007	40.962121694640146
2008	41.13024578924763
2009	40.61058336461148
2010	39.981832788435305
2011	39.36625755457539
2012	39.171319513207756
2013	39.25897019288609
2014	38.81708822063026
2015	38.50110842373113
2016	38.49257751424979
2017	38.77164605799175
2018	38.84909068472111
2019	38.98603479468878
2020	37.290060911941566
2021	39.06545185574243
2022	40.11547675602368
2023	40.87981520752963