Year	% (national estimate)
1960	42.9
1971	40.01
1978	44.54
1981	49.38
1986	43.88
1991	47.03
2001	49.25
2014	36.501
2017	39.291
2018	40.659
2019	39.283
2020	41.895
2021	38.247
2022	37.632