Year	% (national estimate)
1960	18.65245108815124
1970	28.32469775474957
1978	55.641344956413455
1979	58.31055900621118
1980	58.149171270718234
1981	59.73034851182904
1982	59.54178932548317
1984	63.8180099905495
1985	63.72291982889472
1986	61.96691827669836
1987	63.95938385024521
1988	64.78415015641292
1989	65.24590163934427
1990	66.27937792035708
1991	68.71324491454229
1992	69.82591876208897
1993	71.35255948089402
1994	72.37074566718744
1995	72.91915395386543
1996	73.51192693356377
1997	73.64587057561673
1998	73.89199042953175
1999	74.83830347432888
2000	75.60961615697975
2001	76.11831892561631
2002	76.41073472675627
2003	78.30164403145103
2004	78.11623188822861
2005	80.00144686392245
2006	80.16946461307505
2007	80.94142834411028
2008	81.00206041962912
2009	82.18969693389259
2010	83.12155929177206
2011	81.4285288329656
2012	82.50354545728857
2013	83.17151109199287
2014	83.44445822737703
2015	83.86150509447799
2016	83.48885837338493
2017	83.80221653878942
2018	84.5955556935882
2019	85.09802094013111
2020	84.9278953052538
2021	86.28711601359585
2022	86.65916796045752
2023	86.96101294351493