Year	% of total labor force (national estimate)
1975	14.69
1976	12.75
1977	11.83
1978	14.26
1979	13.63
1980	10.46
1981	11.35
1982	19.6
1983	14.65
1984	13.91
1986	8.71
1988	6.23
1989	5.29
1990	5.63
1991	5.23
1992	4.35
1993	4.49
1994	5.87
1995	4.7
1996	7.414
1997	7.136
1998	7.307
1999	11.158
2000	10.491
2001	10.39
2002	10.168
2003	9.765
2004	10.162
2005	9.34
2006	9.024
2007	8.427
2008	9.285
2009	11.313
2010	8.278
2011	7.277
2012	6.562
2013	6.074
2014	6.483
2015	6.313
2016	6.673
2017	7.257
2018	7.623
2019	7.493
2020	10.934
2021	9.281
2022	8.249
2023	9.013