Year	% (national estimate)
1983	32.864
1984	31.571
1985	30.753
1986	29.486
1987	28.488
1988	28.814
1989	29.838
1990	30.162
1991	29.035
1992	28.356
1993	26.47
1994	26.493
1995	25.593
1996	25.489
1997	24.447
1998	28.113
1999	27.152
2000	27.383
2001	26.031
2002	26.229
2003	24.962
2004	26.507
2005	24.724
2006	23.931
2007	23.723
2008	23.326
2009	22.68
2010	20.012
2011	15.985
2012	12.946
2013	11.786
2014	13.193
2015	12.935
2016	12.912
2017	14.058
2018	13.856
2019	14.481
2020	13.83
2021	13.36
2022	16.077
2023	18.282