Year	% (national estimate)
1964	23.81
1973	28.29
1985	25.32
2001	47.21
2002	46.841
2003	47.779
2004	45.828
2005	42.661
2007	39.524
2008	39.223
2009	42.924
2010	42.678
2011	43.14
2012	44.282
2013	43.279
2014	42.707
2015	42.438
2016	42.108
2017	41.462
2018	40.021
2019	39.319
2020	39.27
2021	40.68
2022	37.278
2023	37.883