Year	% (national estimate)
1960	19.32
1971	19.53
1978	19.93
1981	32.58
1986	33.09
1991	37.66
2001	44.89
2014	33.157
2017	35.457
2018	35.272
2019	31.503
2020	35.018
2021	31.795
2022	30.831