Year	% (national estimate)
1960	26.724644494065103
1970	27.25556813892035
1980	37.30812961910176
1981	38.30973830973831
1982	40.08494434680727
1983	41.68504631671813
1984	41.63763066202091
1985	40.129275518448694
1986	40.21473226420223
1988	41.465035894708855
1989	41.73041413874968
1990	42.29591157277933
1991	41.603510171519744
1992	44.24579525890609
1993	45.288161993769464
1994	45.68594178305705
1995	45.14369345396488
1996	47.67490031588214
1997	49.12686889298749
1998	49.66726924991485
1999	50.29068617757564
2000	50.49556598852374
2001	49.7322587624405
2002	49.85180632384074
2003	51.944985862135226
2004	54.42093880832894
2005	55.90437226907128
2006	56.63642841482132
2007	57.95273863698668
2008	60.27526061184165
2009	61.58777868163079
2010	63.10061020784784
2011	65.37002404488378
2012	65.98416744934926
2013	66.84538082280356
2014	67.79199417562118
2015	67.61772927642188
2016	68.44370101576938
2017	69.52598055648676
2018	70.60460613882951
2019	71.41909275558565
2020	67.30575922421949
2021	67.72859216255442
2022	70.97587579505048
2023	72.88133219422697