Year	% of total labor force (national estimate)
1970	5.136
1980	1.661
1982	3.4
1983	3.8
1984	5.84
1985	6.92
1986	8.29
1987	7.33
1988	7.26
1989	5.73
1990	4.5
1991	0.481
1992	3.71
1993	4.11
1995	3.15
1996	2.52
1997	2.45
1998	3.2
1999	3.43
2000	3
2001	3.53
2002	3.48
2003	3.61
2004	3.54
2005	3.53
2007	3.23
2008	3.32
2009	3.66
2010	3.39
2011	3.05
2012	3.1
2013	3.16
2014	2.88
2015	3.1
2016	3.44
2017	3.41
2018	3.3
2019	3.26
2020	4.54
2021	4.64
2022	3.93