Year	Percent of total labor force (Units)
1980	0.209
1981	0.190
1982	0.428
1983	0.850
1984	1.138
1985	0.982
1986	0.832
1987	0.798
1988	0.720
1989	0.564
1990	0.501
1991	1.083
1992	2.549
1993	4.504
1994	4.723
1995	4.233
1996	4.656
1997	5.199
1998	3.856
1999	2.723
2000	1.824
2001	1.703
2002	2.546
2003	3.691
2004	3.879
2005	3.763
2006	3.332
2007	2.766
2008	2.577
2009	3.701
2010	3.516
2011	2.843
2012	2.905
2013	3.158
2014	3.044
2015	3.178
2016	3.323
2017	3.088
2018	2.547
2019	2.306
2020	3.170
2021	2.993
2022	2.166
2023	2.035
2024	2.250
2025	2.400
2026	2.500
2027	2.500
2028	2.500
2029	2.500