Year	Percent of total labor force
1980	0.313
1981	0.365
1982	0.67
1983	1.022
1984	1.254
1985	0.906
1986	0.656
1987	0.441
1988	0.636
1989	1.658
1990	2.594
1991	2.457
1992	4.19
1993	5.297
1994	5.315
1995	4.794
1996	3.698
1997	3.749
1998	2.86
1999	2.034
2000	2.178
2001	2.335
2002	3.076
2003	3.358
2004	3.05
2005	2.583
2006	2.875
2007	2.292
2008	2.983
2009	7.233
2010	7.558
2011	7.05
2012	6.025
2013	5.392
2014	4.958
2015	3.992
2016	3.008
2017	2.825
2018	2.742
2019	3.3
2020	3.6
2021	3.75
2022	3.75
2023	3.75
2024	3.75