Year	% of total labor force
1991	24.28495162135418
1992	25.053074096820342
1993	25.91346497705412
1994	26.755142907957925
1995	27.568403616990935
1996	28.427790164918747
1997	28.536118802138482
1998	28.672134200998823
1999	28.775556474155735
2000	28.813666513371405
2001	28.844866847012213
2002	28.871293020148332
2003	28.900353679331165
2004	28.94388244385973
2005	28.98713559345322
2006	29.006640403233035
2007	29.00886072445898
2008	29.01561141466731
2009	29.027260568739738
2010	28.99543697468319
2011	28.978004858890017
2012	29.169448132393676
2013	29.3029184022646
2014	29.454720257142448
2015	29.57863688907273
2016	29.691032093431108
2017	29.824478385201836
2018	29.941834448907706
2019	30.009423077329174
2020	29.979065948230595
2021	30.107164486445736
2022	29.822048679199526
2023	29.571055282594155