Year	Percent of total labor force
1980	2.017
1981	2.208
1982	2.35
1983	2.658
1984	2.708
1985	2.625
1986	2.767
1987	2.85
1988	2.517
1989	2.25
1990	2.1
1991	2.092
1992	2.15
1993	2.5
1994	2.892
1995	3.15
1996	3.367
1997	3.4
1998	4.1
1999	4.667
2000	4.733
2001	5.042
2002	5.358
2003	5.242
2004	4.733
2005	4.425
2006	4.117
2007	3.833
2008	3.983
2009	5.075
2010	5.058
2011	4.583
2012	4.325
2013	4.008
2014	3.583
2015	3.375
2016	3.108
2017	2.817
2018	2.442
2019	2.433
2020	2.433
2021	2.433
2022	2.433
2023	2.433
2024	2.433