Year	% (national estimate)
1972	36.91
1974	31.81
1976	30.4
1978	31.77
1979	30.56
1980	30.25
1981	30.01
1982	29.43
1983	32.78
1986	31.3
1987	30.15
1988	31.64
1989	31.72
1990	53.781
1991	55.182
1992	56.181
1993	60.194
1994	61.837
1995	61.688
1996	60.262
1997	59.216
1998	57.22
1999	57.023
2000	58.344
2001	57.432
2002	53.428
2003	53.596
2004	54.445
2005	55.77
2006	56.224
2007	55.573
2008	53.969
2009	52.739
2010	52.682
2011	50.435
2012	52.456
2013	52.51
2014	52.531
2015	51.761
2016	51.288
2017	51.118
2018	49.883
2019	48.69
2020	44.928
2021	45.747
2022	47.371