Year	Percent of total labor force
1989	0.025
1990	2.9
1991	6.78
1992	13.24
1993	15.84
1994	14.05
1995	11.37
1996	10.988
1997	14.023
1998	12.367
1999	13.79
2000	18.134
2001	17.514
2002	17.416
2003	13.857
2004	12.192
2005	10.177
2006	9.022
2007	6.935
2008	5.664
2009	6.878
2010	10.306
2011	11.35
2012	12.379
2013	13.038
2014	11.524
2015	9.233
2016	7.666
2017	6.23
2018	5.2
2019	5
2020	5
2021	5
2022	5
2023	5
2024	5