Year	% (national estimate)
1983	47.545
1984	45.245
1985	43.309
1986	41.606
1987	40.261
1988	39.067
1989	39.75
1990	40.098
1991	37.709
1992	35.574
1993	35.014
1994	35.703
1995	36.432
1996	35.591
1997	38.324
1998	42.956
1999	46.262
2000	48.074
2001	46.78
2002	44.924
2003	45.4
2004	44.829
2005	46.331
2006	48.385
2007	63.019
2008	57.08
2009	45.345
2010	38.703
2011	36.171
2012	34.791
2013	36.551
2014	36.803
2015	37.83
2016	41.984
2017	39.959
2018	40.295
2019	41.199
2020	37.014
2021	43.983
2022	47.167
2023	48.16