Year	% (national estimate)
1986	74.404
1987	72.571
1988	66.284
1989	62.983
1990	61.421
1991	56.214
1992	54.863
1993	55.548
1994	58.777
1995	62.436
1996	61.496
1997	60.066
1998	56.977
1999	56.494
2000	56.248
2001	57.995
2002	58.847
2003	58.514
2004	59.809
2005	59.387
2006	60.93
2007	60.325
2008	58.076
2009	53.507
2010	51.104
2011	50.674
2012	50.303
2013	50.743
2014	53.903
2015	54.85
2016	56.145
2017	56.971
2018	56.468
2019	56.715
2020	56.059
2021	58.361
2022	61.217
2023	61.731