Year	Percent of total labor force (Units)
1980	7.133
1981	9.650
1982	10.725
1983	11.475
1984	11.750
1985	11.375
1986	11.325
1987	10.425
1988	8.575
1989	7.225
1990	7.100
1991	8.850
1992	9.950
1993	10.375
1994	9.500
1995	8.625
1996	8.100
1997	6.950
1998	6.250
1999	5.975
2000	5.450
2001	5.100
2002	5.200
2003	5.000
2004	4.750
2005	4.825
2006	5.425
2007	5.350
2008	5.725
2009	7.625
2010	7.900
2011	8.100
2012	7.975
2013	7.625
2014	6.200
2015	5.425
2016	4.950
2017	4.450
2018	4.175
2019	3.925
2020	4.650
2021	4.625
2022	3.875
2023	4.025
2024	4.150
2025	4.050
2026	4.000
2027	4.000
2028	4.000
2029	4.000