Year	% of total labor force (national estimate)
1982	22
1983	20.9
1984	21.1
1985	21.6
1986	21.7
1987	21.5
1988	21.4
1989	22.6
1990	23.6
1991	24.5
1992	26.3
1993	27.7
1994	30
1995	35.6
1996	38.8
1997	36
1998	34.5
1999	32.4
2000	32.2
2001	30.52
2002	31.94
2003	36.69
2004	37.161
2005	37.32
2006	36.392
2007	35.231
2008	33.93
2009	32.351
2010	33.135
2011	31.502
2012	31.096
2013	29.017
2014	28.215
2015	26.395
2016	24.312
2017	22.857
2018	21.208
2019	17.414
2020	16.575
2021	15.801
2022	14.477