Year	% (national estimate)
1962	52.69
1974	45.2
1980	50.92
1981	50.64
1982	39.22
1988	45.46
1989	45.34
1990	43.88
1996	47.96
1997	47.8
1998	52.43
2000	51.821
2001	59.223
2002	49.98
2003	52.728
2004	54.025
2005	52.48
2006	54.337
2007	50.9
2008	50.782
2009	47.656
2010	44.69
2011	41.751
2012	43.003
2013	41.111
2014	40.154
2015	42.777
2016	44.807
2017	45.24
2018	43.997
2019	43.955
2020	39.696
2021	45.543
2022	45.292
2023	43.373