Year	Percent of total labor force
1980	11.502
1981	10.291
1982	19.814
1983	20.999
1984	17.515
1985	14.975
1986	12.299
1987	10.984
1988	9.875
1989	7.98
1990	7.75
1991	8.217
1992	6.7
1993	6.5
1994	7.808
1995	7.375
1996	6.5
1997	6.108
1998	6.217
1999	10.008
2000	9.708
2001	9.867
2002	9.8
2003	9.533
2004	10.017
2005	9.3
2006	7.95
2007	7.008
2008	7.75
2009	10.833
2010	8.153
2011	7.119
2012	6.432
2013	5.932
2014	6.392
2015	6.214
2016	6.49
2017	6.674
2018	6.901
2019	6.493
2020	6.242
2021	6.072
2022	6.042
2023	6.023
2024	6.027