Year	Percent of total labor force
1980	8.375
1981	9.184
1982	10.981
1983	11.573
1984	12.216
1985	14.418
1986	12.504
1987	14.102
1988	18.78
1989	18.939
1990	16.719
1991	15.971
1992	14.674
1993	13.262
1994	14.008
1995	14.019
1996	14.317
1997	13.37
1998	11.599
1999	9.532
2000	13.526
2001	14.026
2002	13.489
2003	13.042
2004	11.749
2005	9.781
2006	8.662
2007	6.372
2008	5.579
2009	6.557
2010	6.516
2011	4.481
2012	4.05
2013	4.098
2014	4.823
2015	5.052
2016	5.494
2017	6
2018	6.413
2019	6.115
2020	6.045
2021	6.012
2022	6.001
2023	6.002
2024	6.007