Year	Percent of total labor force
1980	21.5
1981	21.861
1982	22.229
1983	22.603
1984	22.982
1985	23.369
1986	23.762
1987	24.161
1988	24.567
1989	24.98
1990	25.4
1991	25.827
1992	26
1993	26
1994	26
1995	26
1996	25
1997	25
1998	24
1999	22
2000	20
2001	21
2002	20.5
2003	20
2004	19.5
2005	21.4
2006	13.4
2007	15.2
2008	13
2009	13
2010	10.7
2011	12.2
2012	16.8
2013	16.4
2014	12
2015	10
2016	9
2017	9
2018	8.5
2019	8.5
2020	8.5
2021	8.5
2022	8.5
2023	8.5
2024	8.5