Year	% (national estimate)
1977	37.24
1979	37.65
1980	37.53
1983	44.769
1984	43.828
1985	44.298
1986	44.246
1987	43.58
1988	43.717
1989	44.389
1990	44.834
1991	45.831
1992	46.306
1993	45.713
1994	45.476
1995	45.813
1996	45.626
1997	45.999
1998	46.112
1999	47.421
2000	48.849
2001	47.747
2002	47.651
2003	47.404
2004	48.199
2005	48.801
2006	48.735
2007	49.589
2008	49.934
2009	49.244
2010	49.586
2011	49.4
2012	49.233
2013	49.047
2014	48.946
2015	48.788
2016	48.952
2017	50.021
2018	50.965
2019	51.475
2020	50.83
2021	51.079
2022	52.026
2023	51.946