Year	% of total labor force
1991	0.3633317312134138
1992	0.3518865812576493
1993	0.34078749173590334
1994	0.33000147086369874
1995	0.43381735680412076
1996	0.42008953655722325
1997	0.4069185287710675
1998	0.39423236664329403
1999	0.3820227851793389
2000	0.3702253113302585
2001	0.2718155580430035
2002	0.2632058028105993
2003	0.2550077741953383
2004	0.24012310768698103
2005	0.24358437508096412
2007	0.22790013540375773
2008	0.22041296573259658
2009	0.2092603113018394
2010	0.20234006282658948
2011	0.19566762881995753
2012	0.18927189380725146
2013	0.18318404399130894
2014	0.17742583210045654
2015	0.17199614505677108
2016	0.16698583380317425
2017	0.1651518984586073
2018	0.15675974258154568
2019	0.1558226166328744
2020	0.15273991100817366