Year	% (national estimate)
1972	37.86
1974	32.39
1976	31.2
1978	32.46
1979	31.07
1980	31.21
1981	31.55
1982	31.15
1983	34.1
1986	33.18
1987	31.34
1988	33.62
1989	32.81
1990	61.647
1991	63.88
1992	63.771
1993	68.939
1994	68.908
1995	68.089
1996	65.87
1997	65.082
1998	63.149
1999	61.428
2000	62.042
2001	60.649
2002	56.472
2003	55.341
2004	56.304
2005	57.885
2006	58.418
2007	58.392
2008	57.08
2009	54.398
2010	54.489
2011	52.549
2012	54.964
2013	55.541
2014	55.251
2015	54.277
2016	53.278
2017	52.822
2018	50.98
2019	49.2
2020	45.157
2021	45.893
2022	47.506