Year	% of total labor force (national estimate)
1991	17.55
2001	16.1
2006	31.11
2007	28.984
2008	23.405
2009	24.068
2010	27.312
2011	27.582
2012	28.01
2013	27.49
2014	27.517
2015	27.695
2016	25.408
2017	20.527
2018	18.4
2019	15.692
2020	15.868
2021	14.897
2022	12.657
2023	10.668