Year	% of total labor force
1991	35.15598565338025
1992	35.46247198988308
1993	35.94206691968765
1994	35.944143483046645
1995	36.49076573225937
1996	36.677247787424584
1997	37.00825037926806
1998	37.36331497163528
1999	37.62753283779656
2000	37.800367817950324
2001	38.01561653184528
2002	38.47744809482141
2003	38.99213653652864
2004	39.29858934169279
2005	39.53311490755909
2006	39.976394559139365
2007	40.18691588785047
2008	40.301332670503434
2009	40.21080318682576
2010	40.03846007387381
2011	40.022815857020625
2012	40.1112777957122
2013	40.23348519362187
2014	40.309724436347075
2015	40.372399931739324
2016	40.523990976132254
2017	40.645430255253835
2018	40.82778702163062
2019	40.90307453768483
2020	40.8808847998434
2021	41.274291791549835
2022	41.175356885910105
2023	41.41349415755749