Year	% (national estimate)
1960	10.056057659306715
1971	15.720360180090045
1982	20.89225401774116
1990	33.497931402642465
1994	24.809743122429374
1995	40.453460620525064
1998	29.628643684280586
1999	38.24123139036084
2000	36.895674300254456
2001	32.67453798767967
2002	32.173800594853226
2003	35.224922440537746
2004	36.601728809185914
2005	36.316337148803335
2006	36.91810754322629
2007	36.508141638666324
2008	34.998023455000656
2009	35.53383735939517
2010	34.635974304068526
2011	34.293405114401075
2012	33.61413043478261
2013	34.3921139101862
2014	34.76584022038568
2015	34.56979500766978
2016	33.39904252323289
2021	29.687499999999993
2022	28.448275862068968