Year	% of total labor force
1991	22.319631939679432
1992	22.738672668428215
1993	23.001091342906225
1994	23.207187481964564
1995	23.400792496504597
1996	23.59221541382584
1997	23.59795003332119
1998	23.699919007253314
1999	23.6908747531977
2000	23.691757241826984
2001	23.61476865978448
2002	23.537931095479284
2003	23.48255084540924
2004	23.573348848125086
2005	23.928326185282707
2006	24.30150398605874
2007	24.683701592813716
2008	25.108040120999842
2009	25.53265362733305
2010	25.95845702334368
2011	26.385378663705737
2012	26.815302041141038
2013	27.248685440123122
2014	27.68461962048685
2015	28.266807149789543
2016	29.00981155470643
2017	29.776555011297933
2018	30.567545720109244
2019	31.38592967329706
2020	31.40969779661927
2021	31.9195274788527
2022	31.64111041063749
2023	31.78467254856689