Year	% (national estimate)
1960	28.837772397094437
1970	36.97916666666667
1980	69.43291839557399
1981	71.03969754253309
1982	71.05991943605238
1983	73.39531329597555
1984	74.10145296966608
1985	76.25816365731846
1986	79.49732074508805
1987	81.15942028985508
1988	81.10446621707597
1989	80.73738680465718
1990	81.54306704838098
1991	83.5881343203519
1992	83.54678480332932
1993	84.23452680576979
1994	84.40979655585625
1995	86.85868102288022
1996	86.96458640286255
1997	87.1981981981982
1998	88.06941155501234
1999	89.03033342334349
2000	88.35205514424305
2001	88.90594616722954
2002	90.69557943504279
2003	90.38476628913709
2004	90.90741617979894
2005	90.36678492765856
2006	90.52785145888593
2007	91.48997890295357
2008	91.85978426346402
2009	92.2585255468657
2010	91.595293364284
2011	92.8590756575387
2012	92.10777782264033
2013	92.66523884400586
2014	92.76977291590134
2015	92.46703565033371
2016	92.34443883330832
2017	92.7344398340249
2018	92.13563322492554
2019	92.7119106806719
2020	94.60556844547564
2021	84.92062381984753
2022	89.7489207490507
2023	89.7898722469507