Year	Percent of total labor force
1980	3.8
1981	3.9
1982	3.522
1983	4.35
1984	3.876
1985	3.183
1986	2.817
1987	1.736
1988	1.366
1989	1.078
1990	1.33
1991	1.798
1992	1.957
1993	1.971
1994	1.919
1995	3.187
1996	2.767
1997	2.202
1998	4.702
1999	6.249
2000	4.946
2001	5.097
2002	7.305
2003	7.923
2004	6.81
2005	5.576
2006	4.781
2007	4.022
2008	3.522
2009	5.246
2010	4.322
2011	3.408
2012	3.303
2013	3.376
2014	3.262
2015	3.307
2016	3.387
2017	3.119
2018	2.809
2019	2.809
2020	2.809
2021	2.809
2022	2.809
2023	2.809
2024	2.809