Year	% of total labor force (national estimate)
1975	8.252
1976	7.85
1977	8.063
1978	8.696
1979	10.041
1980	7.668
1981	7.842
1982	6.548
1983	6.037
1991	4.7
2014	6.862
2017	9.316
2018	8.7
2019	6.6
2020	7.409
2021	4.905
2022	5.191