Year	% (modeled ILO estimate)
1991	49.383
1992	49.645
1993	49.902
1994	50.012
1995	49.985
1996	50.176
1997	50.308
1998	50.323
1999	50.315
2000	50.332
2001	50.463
2002	50.522
2003	50.542
2004	50.538
2005	50.525
2006	48.864
2007	47.208
2008	45.561
2009	43.925
2010	42.299
2011	40.688
2012	39.098
2013	39.107
2014	39.073
2015	39.013
2016	39.022
2017	38.966
2018	38.848
2019	38.698
2020	38.333
2021	38.209
2022	37.908
2023	37.886