Year	% of total labor force (national estimate)
1991	12.413358271977723
2002	13.711737137777893
2004	11.93248043346678
2005	12.336793312368236
2006	11.241389307052177
2007	10.495344560367219
2008	10.445764412883253
2009	10.54318261999834
2010	11.110532057383098
2011	11.768984082270515
2012	11.876534425495558
2013	11.614661393346497
2014	11.673785760634523
2015	11.987614254166246
2016	12.022437222166497
2021	10.511101216231692