Year	Percent of total labor force (Units)
1989	0.025
1990	2.900
1991	6.780
1992	13.240
1993	15.840
1994	14.050
1995	11.370
1996	10.988
1997	14.023
1998	12.367
1999	13.790
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	11.350
2012	12.379
2013	13.038
2014	11.524
2015	9.233
2016	7.666
2017	6.230
2018	5.273
2019	4.275
2020	5.207
2021	5.346
2022	4.206
2023	4.419
2024	4.300
2025	4.200
2026	4.200
2027	4.200
2028	4.200
2029	4.200