Year	% (national estimate)
1961	25.59789449593775
1972	24.847504045811032
1979	39.3293835875457
1980	39.52753916119252
1981	31.939883809042684
1982	39.848101265822784
1984	55.323590814196244
1986	66.17490696438065
1987	64.63593854375418
1989	64.04359962780805
1990	62.32073011734028
1991	60.56181337783341
1992	58.09018567639257
1993	40.52581392180902
1994	60.81664703572831
1995	63.779324568187675
1997	75.3081825370982
1998	75.83420851632614
1999	79.0835171917995
2000	78.16007088009451
2001	75.81592125712312
2002	77.59415223263943
2003	77.87590551181103
2004	79.14238085667333
2005	78.48475230119394
2006	79.67769336038884
2007	81.13434632164885
2008	81.5177038377651
2009	81.44773913445107
2010	83.23102710825964
2011	82.63160949561787
2012	82.35841052521472
2013	81.97711788147576
2014	81.57835825291906
2015	80.26290789911175
2016	81.42087023488641
2017	81.87442442560628
2018	82.51279565952316
2019	82.57222739981361
2020	76.56758071536473
2021	81.88334344660194
2022	80.95792691803756
2023	80.8660761978112