Year	% (national estimate)
1963	52.75
1973	45.66
1984	45.49
2000	62.06
2001	51.384
2002	49.737
2003	50.625
2004	47.659
2005	49.044
2006	49.5
2007	51.414
2008	49.098
2009	47.368
2010	44.647
2011	43.615
2012	48.164
2013	47.735
2014	48.212
2015	45.728
2016	42.608
2017	42.632
2018	45.627
2019	45.31
2020	43.932
2021	45.396
2022	42.964
2023	37.933