Year	% (national estimate)
1960	5.863192182410423
1966	7.198323678047578
1973	5.5456626812515895
1975	6.614335349375884
1976	7.95243403939056
1977	8.735167886897248
1978	10.561056105610561
1979	10.562805872756933
1980	10.05844773684926
1981	12.152777777777777
1982	12.08540630182421
1983	22.129032258064516
1984	23.68006304176517
1986	12.652693840812654
1989	41.793334263003764
1990	36.53504577128023
1991	31.107031911889298
1992	32.21248940378638
1993	30.39000274649822
1994	31.037277147487842
1995	29.439825541774567
1996	18.695203713254255
1998	27.342657342657343
1999	27.6428280635093
2000	29.86897623806351
2001	29.392039655926517
2002	26.813282842994468
2005	30.717041372888122
2006	29.39621591541458
2007	32.30125523012552
2008	30.030411943599667
2009	31.55020926300618
2010	30.790085205267236
2011	30.12291495577485
2012	30.31451820360417
2013	31.247102457116366
2014	31.794808166866563
2015	32.14442726873059
2016	32.939638202796104
2017	32.82634730538923
2018	27.06602406788682
2019	23.19006373590456
2020	21.336178157087613
2021	22.200193913433573
2022	21.677432407046144