Year	% (national estimate)
1960	35.48985507246377
1970	31.37254901960785
1971	40.41418905064589
1974	45.99601593625498
1978	44.68444778362134
1979	45.711835334476845
1980	40.09533898305085
1981	45.88595953402821
1983	46.6837356742258
1985	48.71257853886904
1986	48.969331322272495
1987	50.445746306673456
1988	58.33563345293956
1989	57.699313437018354
1990	50.941619585687384
1991	66.93907875185735
1992	58.00524934383202
1993	59.42028985507246
1994	59.3833780160858
1995	59.560090102027296
1996	63.09828771740595
1997	61.36363636363637
1998	62.39702365134201
1999	62.130098640362576
2000	62.418691092526224
2001	62.4
2002	63.65343347639485
2003	65.814266487214
2004	67.5531914893617
2005	69.62529896359287
2006	71.10932691021009
2007	68.7990424258545
2008	70.50852005903663
2009	68.71974179666488
2010	68.73062444641276
2011	67.5965005450429
2012	71.1017779644407
2013	70.91683895194296
2014	71.49018130050663
2015	69.88292917710677
2016	71.89923323332029
2019	72.53179890975166
2020	73.2458758837392
2021	74.11621617296397
2022	75.79522862823062