Year	% (national estimate)
1979	61.329
1980	63.135
1981	63.917
1982	61.817
1983	58.243
1984	59.108
1985	60.425
1986	61.172
1987	60.648
1988	61.509
1989	64.052
1990	62.716
1991	57.476
1992	56.006
1993	55.981
1994	58.662
1995	60.749
1996	60.447
1997	58.953
1998	59.761
1999	60.749
2000	61.694
2001	61.143
2002	61.018
2003	61.819
2004	62.163
2005	63.288
2006	63.699
2007	64.133
2008	64.509
2009	61.18
2010	60.52
2011	60.386
2012	59.599
2013	58.656
2014	57.703
2015	58.446
2016	58.344
2017	58.472
2018	59.859
2019	60.119
2020	56.813
2021	60.846
2022	65.715
2023	65.076