Year	Percent of total labor force
1980	17.1
1981	19.8
1982	22.8
1983	23.4
1984	20.7
1985	21.8
1986	18.9
1987	16.8
1988	15
1989	14.6
1990	14.2
1991	16
1992	16.7
1993	17
1994	14.6
1995	13.7
1996	13.4
1997	13.5
1998	13.3
1999	11.7
2000	10.1
2001	11.4
2002	12.3
2003	12
2004	10.6
2005	11.3
2006	10.5
2007	11.2
2008	11.8
2009	15.3
2010	16.4
2011	15.9
2012	14.5
2013	14.3
2014	13.9
2015	12
2016	11.8
2017	10.8
2018	11
2019	11
2020	11.2
2021	11.4
2022	11.4
2023	11.4
2024	11.4