Year	% (national estimate)
1961	75.33
1971	64.1
1980	51.63
1981	63.46
1982	55.22
1983	56.66
1984	59.99
1985	58.69
1986	59.36
1987	61.53
1988	61.14
1989	60.95
1990	60.14
1991	60.49
1992	61.65
1993	58.2
1994	59.216
1995	58.871
1996	56.375
1997	55.448
1998	55.503
1999	54.171
2000	51.491
2001	50.147
2002	51.011
2003	49.742
2004	53.167
2005	54.391
2006	54.372
2007	56.289
2008	56.426
2009	56.49
2010	54.229
2011	55.058
2012	55.563
2013	55.446
2014	55.625
2015	54.307
2016	54.788
2017	53.872
2018	54.038
2019	52.69
2020	53.196
2021	52.105
2022	53.702
2023	56.104