Year	Percent of total labor force (Units)
1980	2.700
1981	3.417
1982	4.342
1983	4.758
1984	4.233
1985	3.850
1986	3.608
1987	2.867
1988	2.350
1989	2.025
1990	2.242
1991	4.000
1992	7.100
1993	11.150
1994	10.783
1995	10.417
1996	10.883
1997	10.875
1998	8.817
1999	7.550
2000	6.342
2001	5.967
2002	6.083
2003	6.692
2004	7.517
2005	7.908
2006	7.167
2007	6.242
2008	6.275
2009	8.417
2010	8.700
2011	7.875
2012	8.067
2013	8.108
2014	8.042
2015	7.517
2016	7.058
2017	6.783
2018	6.433
2019	6.908
2020	8.483
2021	8.892
2022	7.483
2023	7.667
2024	8.365
2025	8.243
2026	7.700
2027	7.500
2028	7.500
2029	7.500