Year	% (national estimate)
1981	52.252052211522
1983	52.07624945775482
1984	53.14833655820187
1985	53.13189266432266
1986	53.49847869212055
1987	54.39763505393424
1988	52.88073785494598
1989	53.43682278170643
1990	52.902218821430935
1991	52.183142888509586
1992	50.240816460104796
1993	49.76285659848668
1994	49.49167696150601
1995	48.72793545244209
1996	48.011539574433264
1997	47.22005196825921
1998	47.086750437015205
1999	47.60200704058108
2000	47.481404036285255
2001	47.01141228470878
2002	46.505218482516476
2003	45.59650938832276
2004	45.55712399554221
2005	45.40490514048318
2006	45.331079250625855
2007	45.143077853721785
2008	45.11800123548467
2009	43.730486773354656
2010	43.80226332607454
2011	43.69592414294526
2012	43.50131380023683
2013	42.76041210707033
2014	43.81567591181061
2015	43.83517155580301
2016	44.03516240003332
2017	42.91136469266853
2018	43.14377524719435
2019	43.41714587612643
2020	41.975723388878706
2021	43.25427869795235
2022	43.86337049383157
2023	44.584208663909145