Year	% (national estimate)
1961	20.4203228252627
1971	27.04908990623276
1975	38.30110797306104
1978	41.82058047493404
1979	44.8087431693989
1980	46.4984984984985
1990	63.63636363636363
1991	63.90996784565917
1992	49.04242424242425
1993	51.55772755039707
1994	52.996960486322195
1995	51.07632093933463
1996	50.87125485771593
1997	51.341140914242544
1998	55.65379825653798
1999	56.47924863561366
2000	56.36132315521628
2001	56.25790139064476
2002	57.605559926567004
2003	58.08087210039295
2004	56.96218866950574
2005	57.45501285347044
2006	58.71124775813477
2007	57.87481070166582
2008	58.11923786109404
2009	58.745833847673126
2010	59.73521939511548
2011	59.37902454574434
2012	60.15134009623808
2013	62.13583545323226
2014	60.6453360157852
2015	59.83525492543529
2016	60.152290826352264
2017	59.03962824319091
2018	59.20383118826699
2019	59.358857684863565
2020	59.96272158843047
2021	59.119374031689
2022	59.67982704483451