Year	% of total labor force (national estimate)
1974	8.1
1982	7.3
1986	12.12
1987	11.4
1990	4.78
1991	4.58
1992	3.06
1995	3.24
1996	4.37
1997	3.32
1998	4.02
1999	3.85
2001	4
2002	4.02
2003	5.3
2004	5.99
2005	4.909
2006	3.575
2007	3.211
2008	3.156
2009	3.292
2010	4.119
2011	4.475
2012	3.755
2013	5.646
2014	7.078
2015	6.147
2016	6.727
2017	5.528
2018	5.622
2019	5.551
2020	10.679
2021	7.94
2022	7.037
2023	5.773