Year	% of total labor force
1991	0.4027437319482708
1992	0.2936764605590882
1993	0.253057664123395
1994	0.2392977090833821
1995	0.372505628497104
1996	0.369582508017556
1997	0.43559338794128155
1998	0.4835652834809764
1999	0.5028702306290626
2000	0.4892149432468538
2001	0.4157774146337203
2002	0.4030181005628192
2003	0.47031257656705583
2004	0.2987912028400104
2005	0.29402474322253747
2007	0.6217588374866316
2008	0.6445759806316443
2009	0.6669608285515948
2010	0.6546208201534283
2011	0.5416248042132237
2012	0.5316002597297894
2013	0.5140605221353887
2014	0.4969998608030185
2015	0.4809406532847065
2016	0.4646249609611206
2017	0.4483253209122684
2018	0.43550972057696324
2019	0.42207916258486194
2020	0.4130460916284188