Year	% of total labor force
1991	0.9241530637753409
1992	1.0438218792521763
1993	1.0106546096534264
1994	0.8406623915247781
1995	0.7080266020029866
1996	0.6944577417744515
1997	0.6122619880897268
1998	0.5324910650565505
1999	0.5160501546036523
2000	0.6104296857988117
2001	0.6652773925623862
2002	0.6446829771459885
2003	0.6790624499012887
2004	0.5864888745193191
2005	0.486531715190959
2007	0.45712547248051166
2008	0.44244267896218004
2009	0.42624437628379935
2010	0.4122241731426086
2011	0.3986143212245432
2012	0.3854063100730469
2013	0.3725734363737714
2014	0.35926825347572844
2015	0.3424353990822584
2016	0.32760946410081615
2017	0.3098267132457453
2018	0.2967916563864919
2019	0.28446907094565865
2020	0.2750710520487053