Year	Percent of total labor force
1984	1.62
1985	2.22
1986	2.75
1987	2.64
1988	2.89
1989	2.86
1990	2.59
1991	2.67
1992	2.79
1993	2.83
1994	4.47
1995	7.42
1996	4.998
1997	4.77
1998	5.46
1999	6.36
2000	6.08
2001	8.1
2002	9.06
2003	9.5
2004	9.86
2005	11.24
2006	10.28
2007	9.11
2008	8.39
2009	7.87
2010	7.14
2011	6.56
2012	6.14
2013	6.25
2014	5.94
2015	6.18
2016	5.61
2017	5.5
2018	5.34
2019	5.2
2020	5.01
2021	5
2022	5
2023	5
2024	5