Year	% of total labor force (national estimate)
1991	12.428054924580065
2002	12.741631840217462
2004	11.2117174945408
2005	11.332937368473745
2006	10.576708061327167
2007	9.85022187621919
2008	9.53698606639912
2009	9.74999102215987
2010	10.15866745851762
2012	10.805984484838815
2013	10.504273010969358
2014	10.551634857223117
2015	10.545730820657141
2016	10.08816290864957
2017	10.603791868369632
2021	9.000523913876782