Year	% of total labor force
1991	29.424931129476583
1992	30.022041879571187
1993	30.298209444651874
1994	30.203294444971384
1995	30.86453164937603
1996	31.53734610901026
1997	32.23742336215898
1998	33.17370036077908
1999	32.92574612792155
2000	33.252700989684485
2001	33.561743044645745
2002	33.870657402458576
2003	34.19607762646114
2004	34.53079251160819
2005	34.85966524263752
2006	35.19132049368333
2007	35.5279959418566
2008	35.8661847524586
2009	36.20792735146315
2010	36.49080021436394
2011	36.71508413281927
2012	36.94352302899041
2013	37.16807410180679
2014	37.33624598682686
2015	37.76471263414976
2016	38.195349981547544
2017	37.99565811883801
2018	38.290145728878684
2019	38.50183101900936
2020	38.534932221063606
2021	39.12786242336819
2022	39.411459571616916
2023	39.51037545247916