Year	% (national estimate)
1960	49.34467693722695
1970	63.63515842502983
1978	74.64762950759656
1979	75.57925707980874
1980	69.72897845726199
1981	87.16763005780348
1982	87.47126436781608
1983	88.35063437139561
1984	89.74358974358975
1985	90.7385697538101
1986	92.21698113207549
1987	92.02813599062134
1988	91.24260355029585
1989	92.23416965352449
1990	71.68758716875871
1991	77.21939773171685
1992	77.0711600308013
1993	76.40424660555082
1994	74.85397149005712
1995	71.02579484103178
1996	69.17541644323745
1997	68.35290417278254
1998	70.79548630519844
1999	71.2652963013887
2000	71.24685849104992
2001	71.25236041092805
2002	71.94132063337562
2003	72.8269650561199
2004	73.0849076188499
2005	73.88947964188934
2006	73.59175229762268
2007	73.16433715248813
2008	73.5237439779766
2009	73.9988251960886
2010	75.67726431893227
2011	75.37417065267707
2012	75.90001519012979
2013	74.99792258729289
2014	75.10791366906476
2015	75.0281214848144
2016	74.66231444781224
2017	74.21671218584098
2018	74.0423655358039
2019	73.37407245744217
2020	73.18092651275087
2021	78.7813245823389
2022	79.22927059656993
2023	79.6953869112935