Year	Percent of total labor force
1980	27.262
1981	25.941
1982	27.577
1983	26.378
1984	25.512
1985	25.01
1986	23.654
1987	20.968
1988	19.089
1989	15.2
1990	15.7
1991	15.4
1992	15.7
1993	16.3
1994	15.4
1995	16.2
1996	16
1997	16.5
1998	15.5
1999	15.7
2000	15.5
2001	15
2002	14.2
2003	11.8
2004	12.2
2005	11.225
2006	10.325
2007	9.85
2008	10.575
2009	11.35
2010	12.375
2011	12.996
2012	13.925
2013	15.275
2014	14.2
2015	13.5
2016	12.835
2017	12.202
2018	11.6
2019	11.028
2020	10.485
2021	9.968
2022	9.477
2023	9.009
2024	8.565