Year	% (national estimate)
1972	35.92
1974	31.21
1976	29.54
1978	31.04
1979	30.01
1980	29.24
1981	28.37
1982	27.64
1983	31.4
1986	29.29
1987	28.89
1988	29.54
1989	30.57
1990	45.535
1991	46.103
1992	48.259
1993	51.06
1994	54.459
1995	55.008
1996	54.409
1997	53.089
1998	51.01
1999	52.419
2000	54.488
2001	54.082
2002	50.263
2003	51.78
2004	52.509
2005	53.567
2006	53.938
2007	52.634
2008	50.728
2009	51.012
2010	50.8
2011	48.234
2012	50
2013	49.534
2014	49.848
2015	49.268
2016	49.307
2017	49.414
2018	48.796
2019	48.187
2020	44.704
2021	45.604
2022	47.239