Year	% (national estimate)
1960	27.398255813953487
1977	39.23855015453779
1979	42.211055276381906
1980	42.28927897867401
1981	44.61919324304645
1982	48.467238122911525
1983	49.614167140752414
1985	51.8138495904691
1986	53.21168966028779
1987	58.365008305881695
1988	59.61947142470013
1989	60.16088844593151
1990	61.969981503184
1991	63.11147430117222
1992	65.54871546980962
1993	66.410285681669
1994	67.73895753444114
1995	68.61850983734641
1996	70.00823793426696
1997	70.80932938083785
1998	71.29677088672476
1999	73.5021892146539
2000	73.9897505978818
2001	74.96530706647438
2002	75.38787404549257
2003	77.10634463361687
2004	77.89849618915997
2005	77.81462049667716
2006	78.85255806764371
2007	79.81836388417568
2008	80.45089945190728
2009	81.43494403191843
2010	82.54035206118891
2011	83.36974098555987
2012	83.66393905191875
2013	83.60056457304165
2014	82.96519220941457
2015	83.8130675904937
2016	84.41250449155586
2017	84.67599060884092
2018	84.98799442135986
2019	85.60819608797058
2020	86.40581927345677
2021	88.17666217430369
2022	87.88008683748393
2023	87.6776991804288