Year	Percent of total labor force
1980	3
1981	5
1982	4.5
1983	5
1984	5
1985	6.25
1986	6.3
1987	6
1988	6.5
1989	8
1990	7.6
1991	6.48
1992	7.112
1993	11.606
1994	13.348
1995	18.904
1996	18.76
1997	16.808
1998	14.789
1999	16.061
2000	17.134
2001	19.209
2002	22.45
2003	17.25
2004	13.625
2005	11.575
2006	10.175
2007	8.475
2008	7.875
2009	8.675
2010	7.75
2011	7.15
2012	7.2
2013	7.075
2014	7.25
2015	6.533
2016	8.467
2017	8.35
2018	9.2
2019	9.943
2020	9.892
2021	9.67
2022	9.41
2023	9.081
2024	8.783