Year	% (national estimate)
1974	60.25
1976	60.63
1977	60.75
1978	61.73
1979	60.41
1981	58.13
1983	59.114
1984	60.598
1985	61.522
1986	63.444
1987	62.677
1988	63.479
1989	62.154
1990	62.444
1991	61.655
1992	61.96
1993	60.147
1994	59.202
1995	60.088
1996	60.734
1997	61.907
1998	61.894
1999	62.417
2000	62.602
2001	62.438
2002	62.833
2003	61.943
2004	62.501
2005	62.478
2006	63.363
2007	63.216
2008	62.688
2009	60.267
2010	58.578
2011	58.15
2012	57.453
2013	56.884
2014	57.016
2015	57.467
2016	57.96
2017	58.116
2018	58.645
2019	59.245
2020	58.522
2021	59.399
2022	60.561
2023	60.408