Year	% of total labor force (national estimate)
1989	16.13
1997	15.94
1999	15.21
2000	14.94
2001	14.4
2002	14.55
2003	14.51
2004	14.23
2005	12.872
2006	12.51
2007	12.365
2008	12.444
2009	13.291
2010	13.049
2011	18.334
2012	17.63
2013	15.934
2014	14.259
2015	15.159
2016	15.557
2017	15.33
2018	15.459
2019	17.153
2022	15.301
2023	15.106