Year	% (national estimate)
1983	28.78
1984	27.668
1985	26.896
1986	27.247
1987	28.264
1988	28.048
1989	28.873
1990	30.078
1991	30.062
1992	31.189
1993	32.457
1994	33.702
1995	35.114
1996	36.662
1997	38.338
1998	40.706
1999	43.333
2000	45.14
2001	45.876
2002	46.955
2003	47.168
2004	47.539
2005	49.444
2006	50.439
2007	54.166
2008	53.586
2009	50.774
2010	48.946
2011	48.094
2012	47.781
2013	48.408
2014	48.954
2015	49.965
2016	51.363
2017	52.147
2018	52.849
2019	53.61
2020	51.983
2021	54.299
2022	56.638
2023	57.881