Year	% of total labor force (national estimate)
1983	6.6
1986	13.3
1987	14.8
1993	19.7
1995	14.6
1996	13.7
2000	13.7
2001	14.7
2002	15.3
2003	14.5
2005	14.8
2006	14
2007	13.1
2008	12.7
2009	12.9
2010	12.5
2011	12.9
2012	12.2
2013	12.6
2014	11.9
2015	13.075
2016	15.275
2017	18.12
2018	18.257
2019	16.801
2020	19.213
2021	19.837
2022	18.2