Year	% of total labor force (national estimate)
1991	12.413358271977723
2002	13.597677371278545
2004	11.832155916670361
2005	12.267507853566027
2006	11.17513839116495
2007	10.432170130725492
2008	10.33268070162507
2009	10.453599138637156
2010	11.013495555368532
2011	11.702094716864655
2012	11.79998172524695
2013	11.516275911085053
2014	11.58179908801116
2015	11.845524928580943
2016	11.884378155613058
2021	10.26691724407782