Year	% of total labor force (national estimate)
1993	12.2
1994	13.654
1995	13.109
1996	11.341
1997	11.894
1998	12.421
1999	16.099
2000	18.546
2001	19.149
2002	18.541
2003	17.55
2004	18.206
2005	16.276
2006	13.395
2007	11.16
2008	9.514
2009	12.023
2010	14.387
2011	13.634
2012	13.966
2013	14.227
2014	11.537
2015	11.492
2016	9.679
2017	8.142
2018	6.544
2019	5.761
2020	6.719
2021	6.894
2022	6.143
2023	5.841