Year	% of total labor force
1991	33.0082119661032
1992	32.93879534941348
1993	32.82666438611142
1994	32.65116063605555
1995	32.38412111935519
1996	32.06128921824537
1997	31.743268155104225
1998	31.428873346228876
1999	31.15522248934226
2000	30.947989648385267
2001	30.67160896772843
2002	30.506098063476905
2003	30.420033212637055
2004	30.369950049514
2005	30.33951101426173
2006	30.213499840255096
2007	30.102231582337563
2008	30.02292856179472
2009	30.00500807862112
2010	30.07058262333862
2011	30.086973099866498
2012	30.191126389916466
2013	30.35383681532548
2014	30.530480858125124
2015	30.693207183462157
2016	30.844964285490704
2017	30.973687765599355
2018	31.093325805400518
2019	31.2250377145672
2020	31.22045926998924
2021	31.37056716347173
2022	31.205719049451137
2023	31.25219727635389