Year	% (national estimate)
1987	45.499712902954066
1988	45.61014243255439
1989	45.76703595057921
1990	46.86807894369264
1991	45.24875537296722
1992	41.9073976859845
1993	38.89949733516209
1994	37.46264796175999
1995	37.054981338673635
1996	36.266196907038186
1997	36.697836422109965
1998	37.53935668204346
1999	37.79233705750723
2000	37.896645099755666
2001	38.14034071558604
2002	37.43697853604567
2003	36.64797393301055
2004	35.94040934994294
2005	35.57811846420385
2006	36.42712651677552
2007	37.4426549237252
2008	37.56651171886178
2009	34.50247141626104
2010	33.69674609435508
2011	32.93529557483224
2012	32.00890433125014
2013	31.82738399410571
2014	31.830271029744225
2015	32.14616525930219
2016	32.763031685971455
2017	33.738462535583
2018	34.71944187841314
2019	35.358555898320795
2020	33.355052821266135
2021	34.826791074550684
2022	36.42518602859919
2023	37.02356561342838