Year	% (national estimate)
1972	46.75912408759124
1974	47.35950731331794
1976	49.48134386127884
1978	53.38357428483545
1979	54.62513695413993
1980	56.024474427361156
1981	56.63897162564666
1982	57.04592078270475
1983	60.16199190040498
1986	60.9308215925281
1987	62.37973059653624
1988	63.327002215891106
1989	65.59327411167513
1990	64.40128098022836
1991	64.92514470169189
1992	67.01755857518313
1993	66.97746167392462
1994	69.15992413802515
1995	70.61268578147859
1996	71.47999388489708
1997	72.1854583772392
1998	73.21296137828742
1999	75.4293927416457
2000	76.72830562210396
2001	77.45510621739257
2002	78.08640618819497
2003	79.71780007650885
2004	79.87493973439302
2005	80.49973789970295
2006	80.49316653409502
2007	80.5391840539184
2008	80.54548320983763
2009	82.9095922217385
2010	82.8780755141481
2011	82.50816025881743
2012	83.01501635860295
2013	82.98307554360008
2014	84.30032217397395
2015	84.3906955862959
2016	84.97884245005835
2017	84.99542027760162
2018	86.69400190777203
2019	87.16014255331379
2020	87.92549965235145
2021	89.0014752119686
2022	89.21896202051445