Year	% (national estimate)
1983	45.17657320538803
1984	46.45149979946244
1985	45.572018906889085
1986	44.72400486658961
1987	45.058226587221725
1988	45.134487553747526
1989	45.3175294582957
1990	45.979371877135755
1991	44.45889442030743
1992	42.20294487695701
1993	38.83097626603367
1994	37.280702329615856
1995	36.74547689279353
1996	35.88536284653929
1997	35.9756658756725
1998	37.29389878757927
1999	38.60455102504739
2000	39.62290277762791
2001	40.177089965205404
2002	39.96317893355808
2003	39.17433767920959
2004	38.54683897044945
2005	38.04365402340812
2006	38.85305129623254
2007	39.56543495066842
2008	39.37943774304349
2009	35.749472128403134
2010	34.725641501672996
2011	33.90874121930463
2012	32.70854534062231
2013	32.42525385151133
2014	32.02704448007068
2015	32.05934260384285
2016	32.5812298167123
2017	33.48724237141342
2018	34.711782963947215
2019	35.391034215744654
2020	33.459963412718004
2021	35.5822812907093
2022	37.44285550773869
2023	38.41650142483814