Year	Percent of total labor force
1981	10.408
1982	10.271
1983	11.123
1984	13.428
1985	15.661
1986	17.232
1987	22.243
1988	22
1989	22
1990	20
1991	18.475
1992	19.575
1993	19.75
1994	18.4
1995	17.175
1996	16.25
1997	15.025
1998	14.225
1999	13.15
2000	12.167
2001	10.825
2002	10.4
2003	10.475
2004	8.375
2005	7.975
2006	6.225
2007	5.55
2008	4.625
2009	5.25
2010	5.925
2011	5.067
2012	4.95
2013	3.675
2014	3.3
2015	3.425
2016	3.95
2017	4.825
2018	4.905
2019	4.825
2020	4.745
2021	4.665
2022	4.585
2023	4.505
2024	4.425