Year	% of total labor force (national estimate)
1995	13.4
1996	13.2
1997	13.8
1998	13.7
1999	13.7
2000	12.6
2001	12.8
2002	13.8
2003	15.2
2004	18.5
2005	20.85
2006	20.85
2007	18.06
2008	13.67
2009	16.116
2010	19.204
2011	22.959
2012	24
2013	22.154
2014	19.223
2015	17.66
2016	15.257
2017	13.477
2018	12.733
2019	10.395
2020	9.011
2021	10.061
2022	8.684