Year	Percent of total labor force
1985	6.893
1986	8.261
1987	8.207
1988	8.079
1989	6.715
1990	5.055
1991	4.345
1992	3.718
1993	3.026
1994	2.947
1995	3.143
1996	2.516
1997	2.445
1998	3.225
1999	3.425
2000	3.1
2001	3.675
2002	3.475
2003	3.6
2004	3.55
2005	3.55
2006	3.325
2007	3.225
2008	3.325
2009	3.675
2010	3.025
2011	3.075
2012	2.925
2013	3.3
2014	2.85
2015	3.15
2016	3.45
2017	3.425
2018	3.325
2019	3.325
2020	3.325
2021	3.325
2022	3.325
2023	3.325
2024	3.325