Year	% of total labor force
2004	0.2699077185510274
2006	0.2540314795809496
2007	0.24804847859465654
2008	0.24247597063131043
2009	0.31560839916406425
2010	0.3085425994945646
2011	0.30060505242506913
2012	0.2931775597927918
2013	0.2848502501542046
2014	0.27685608063381306
2015	0.2695559825214226
2016	0.2632631166394166
2017	0.38460133187441226
2018	0.41181612784270116
2019	0.3688614537936479
2020	0.36298431181804325