Year	% (national estimate)
1979	51.63
1980	51.37
1981	50.78
1982	50.57
1983	52.913
1984	51.845
1985	51.284
1986	51.477
1987	50.738
1988	50.574
1989	50.767
1990	50.626
1991	50.345
1992	49.89
1993	49.263
1994	48.494
1995	48.883
1996	48.873
1997	48.478
1998	48.763
1999	49.068
2000	50.01
2001	50.72
2002	50.866
2003	51.72
2004	51.239
2005	50.979
2006	50.944
2007	51.499
2008	51.928
2009	51.193
2010	51.031
2011	50.859
2012	50.727
2013	50.838
2014	50.336
2015	50.256
2016	50.308
2017	50.403
2018	50.608
2019	50.621
2020	50.167
2021	51.487
2022	52.071
2023	52.186