Year	% (national estimate)
1965	54.73
1975	46.33
1992	44.04
1997	32.6
2000	35.947
2001	36.836
2002	35.071
2003	32.734
2004	33.291
2005	31.118
2006	31.305
2007	31.717
2008	33.984
2009	34.023
2010	35.491
2011	33.856
2012	35.294
2013	34.335
2014	31.538
2015	30.494
2016	27.984
2017	30.522
2018	27.842
2019	27.576
2020	25.353
2021	24.221
2022	26.192
2023	24.357