Year	Percent of total labor force (Units)
1980	2.017
1981	2.208
1982	2.350
1983	2.658
1984	2.708
1985	2.625
1986	2.767
1987	2.850
1988	2.517
1989	2.250
1990	2.100
1991	2.092
1992	2.150
1993	2.500
1994	2.892
1995	3.150
1996	3.367
1997	3.400
1998	4.100
1999	4.667
2000	4.733
2001	5.042
2002	5.358
2003	5.242
2004	4.733
2005	4.425
2006	4.117
2007	3.833
2008	3.983
2009	5.075
2010	5.058
2011	4.583
2012	4.325
2013	4.008
2014	3.583
2015	3.375
2016	3.108
2017	2.825
2018	2.442
2019	2.358
2020	2.783
2021	2.808
2022	2.592
2023	2.567
2024	2.500
2025	2.500
2026	2.500
2027	2.500
2028	2.500
2029	2.500