Year	% (national estimate)
1983	45.056
1984	51.273
1985	52.61
1986	54.658
1987	55.015
1988	56.453
1989	56.227
1990	57.892
1991	57.122
1992	54.818
1993	51.907
1994	49.986
1995	48.023
1996	45.522
1997	44.366
1998	45.108
1999	46.248
2000	46.098
2001	46.462
2002	45.365
2003	44.003
2004	41.29
2005	42.019
2006	44.002
2007	45.346
2008	46.562
2009	46.05
2010	46.126
2011	47.074
2012	46.438
2013	47.023
2014	46.266
2015	45.339
2016	45.699
2017	46.608
2018	47.142
2019	48.356
2020	46.885
2021	49.253
2022	50.178
2023	50.831