Year	% (national estimate)
1977	46.66
1978	46.31
1979	46.22
1980	46.31
1982	45.33
1983	48.756
1984	48.214
1985	48.31
1986	48.133
1987	47.922
1988	48.024
1989	47.918
1990	48.48
1991	49
1992	47.701
1993	46.706
1994	45.703
1995	45.014
1996	45.158
1997	45.286
1998	45.672
1999	46.294
2000	46.985
2001	47.919
2002	48.713
2003	49.379
2004	50.74
2005	50.392
2006	51.041
2007	51.236
2008	51.348
2009	50.249
2010	49.745
2011	49.812
2012	49.603
2013	48.591
2014	48.68
2015	49.198
2016	49.983
2017	50.688
2018	51.208
2019	51.609
2020	50.669
2021	50.602
2022	52.185
2023	46.068