Year	Percent of total labor force
1980	0.723
1981	1.015
1982	1.33
1983	1.615
1984	1.748
1985	1.667
1986	1.458
1987	1.669
1988	1.536
1989	1.402
1990	1.256
1991	1.38
1992	1.634
1993	2.105
1994	2.732
1995	2.961
1996	3.241
1997	3.302
1998	3.057
1999	2.89
2000	2
2001	2
2002	2.417
2003	3
2004	4
2005	4
2006	4
2007	4
2008	4.083
2009	5.583
2010	6
2011	6
2012	6.095
2013	6.821
2014	7.074
2015	6.773
2016	6.342
2017	5.821
2018	4.957
2019	5.001
2020	4.974
2021	5.041
2022	5.062
2023	5.036
2024	5.011