Year	% (national estimate)
1960	50.37
1970	48.49
1976	40.61
1979	48.26
1980	21.3
1981	49.32
1982	53.69
1984	53.85
1990	56.918
1991	53.016
1992	47.923
1993	44.516
1994	41.1
1995	48.091
1996	45.616
1997	44.739
1998	47.433
1999	60.949
2000	61.839
2001	61.383
2002	61.089
2003	60.877
2004	59.285
2005	60.163
2006	60.793
2007	53.59
2008	53.453
2009	51.158
2010	49.331
2011	50.561
2012	52.083
2013	52.934
2014	52.545
2015	53.359
2016	53.276
2017	54.249
2018	54.634
2019	53.419
2020	51.366
2021	52.66
2022	54.557
2023	56.597