Year	% (national estimate)
1964	48.88
1973	45.49
1985	36.79
2001	57.128
2002	56.257
2003	56.748
2004	54.798
2005	52.413
2007	48.808
2008	48.327
2009	52.137
2010	51.658
2011	52.656
2012	53.596
2013	52.093
2014	51.549
2015	51.4
2016	50.06
2017	49.225
2018	48.117
2019	46.743
2020	46.942
2021	48.352
2022	44.452
2023	44.742