Year	% (national estimate)
1960	42.75659824046921
1965	49.44711538461538
1970	55.933282403870635
1974	66.86328483418534
1976	68.09759916492692
1977	70.04698512137823
1978	71.71387547317582
1979	74.3623981840032
1981	76.33904659882162
1983	79.71813641650134
1984	80.05643005643006
1985	80.49761178724667
1986	81.52236603849506
1987	82.27220064063246
1988	80.6580047512243
1989	80.56631139142814
1990	81.82411204004472
1991	83.09227537168714
1992	84.22814714816064
1993	84.59108315098469
1994	82.42322266840111
1995	79.76185519796827
1996	81.71205142833288
1997	81.83267926726111
1998	83.71926171853019
1999	83.62076170841111
2000	84.73271701352245
2001	84.19537391157087
2002	84.53927980016279
2003	83.58549454855911
2004	84.24364179187768
2005	84.94191116487103
2006	85.69158287040291
2007	85.50467250200853
2008	85.04443371852021
2009	86.0775202747554
2010	86.1556030570115
2011	86.60350026606753
2012	87.30275504841978
2013	88.12387159949814
2014	86.8940398360231
2015	85.9287196498084
2016	87.42671405571252
2017	87.40195706591821
2018	86.99483118217816
2019	86.73177881810976
2020	86.98822040791734
2021	86.57955121137168
2022	88.13931410941024
2023	88.18150932805507