Year	% of total labor force (national estimate)
1996	20.93
1997	14.9
1998	14.454
1999	13.79
2000	14.211
2001	13.821
2002	13.829
2003	12.061
2004	11.708
2005	10.033
2006	7.03
2007	6.052
2008	7.739
2009	17.515
2010	19.482
2011	16.206
2012	15.047
2013	11.867
2014	10.846
2015	9.873
2016	9.643
2017	8.715
2018	7.412
2019	6.312
2020	8.098
2021	7.513
2022	6.815
2023	6.465