Year	% (national estimate)
1966	77.77
1972	57.5
1976	67.39
1986	66.28
1991	60.78
1996	50.99
2005	52.427
2006	50.208
2007	48.115
2008	45.146
2009	45.994
2010	45.084
2011	41.944
2012	42.782
2013	41.768
2014	40.164
2015	39.84
2016	41.139
2017	42.276
2018	41.784
2019	40.29
2020	35.97
2021	34.896
2022	35.799