Year	Percent of total labor force
1980	5.288
1981	5.743
1982	6.076
1983	6.147
1984	5.928
1985	6.049
1986	6.665
1987	4.9
1988	4.208
1989	3.108
1990	3.2
1991	6.7
1992	11.8
1993	16.5
1994	16.7
1995	15.5
1996	14.6
1997	12.7
1998	11.5
1999	10.275
2000	9.875
2001	9.2
2002	9.175
2003	9.075
2004	8.875
2005	8.475
2006	7.775
2007	6.95
2008	6.425
2009	8.325
2010	8.5
2011	7.775
2012	7.683
2013	8.192
2014	8.658
2015	9.375
2016	8.792
2017	8.592
2018	7.547
2019	7.184
2020	7.14
2021	7.04
2022	6.94
2023	6.94
2024	6.94