Year	% (national estimate)
1963	57.77
1975	54.15
1984	54
1985	41.17
1990	32.16
1991	53.87
1992	54.24
1993	54.12
1994	57.55
1995	58.38
1996	57.41
1998	59.557
1999	57.522
2000	57.967
2001	59.529
2002	55.122
2003	52.501
2004	52.694
2005	53.064
2006	53.403
2007	55.046
2008	53.888
2009	54.117
2010	53.649
2011	54.625
2012	53.426
2013	53.366
2014	53.075
2015	50.634
2016	49.461
2017	48.028
2018	47.737
2019	47.498
2020	42.754
2021	44.798
2022	45.075
2023	46.475