Year	% (national estimate)
1960	60.86
1970	55.03
1976	45.14
1979	52.83
1980	23.71
1981	53.79
1982	57.96
1984	58.27
1990	60.615
1991	57.143
1992	52.344
1993	49.685
1994	46.276
1995	49.626
1996	47.451
1997	48.445
1998	49.749
1999	63.016
2000	63.33
2001	62.898
2002	62.347
2003	61.39
2004	59.757
2005	60.238
2006	60.822
2007	53.22
2008	53.439
2009	50.491
2010	49.229
2011	50.619
2012	51.466
2013	51.825
2014	51.805
2015	52.3
2016	52.185
2017	53.064
2018	52.888
2019	53.362
2020	51.957
2021	52.894
2022	53.931
2023	54.734