Year	% (national estimate)
1983	40.919
1984	40.048
1985	39.218
1986	38.402
1987	37.617
1988	38.447
1989	38.817
1990	38.805
1991	38.56
1992	35.146
1993	33.911
1994	31.338
1995	30.823
1996	29.978
1997	30.033
1998	30.511
1999	30.285
2000	30.211
2001	30.153
2002	30.203
2003	29.821
2004	32.72
2005	30.428
2006	30.369
2007	29.381
2008	29.006
2009	25.949
2010	23.995
2011	22.755
2012	21.79
2013	18.714
2014	18.196
2015	18.638
2016	19.209
2017	20.085
2018	20.842
2019	21.551
2020	20.531
2021	21.265
2022	23.406
2023	24.325