Year	% (national estimate)
1966	8.72
1975	28.59
1980	24.33
1984	31.12
1989	26.24
1997	27.27
2005	20.769
2006	19.82
2007	20.6
2008	20.684
2009	19.233
2010	20.161
2011	20.587
2012	22.788
2013	21.351
2014	18.45
2015	18.226
2016	20.677
2017	19.263
2019	25.963
2022	16.9
2023	14.838