Year	% (modeled ILO estimate)
1991	56.058
1992	54.567
1993	53.681
1994	52.455
1995	50.275
1996	50.247
1997	49.466
1998	49.235
1999	47.421
2000	45.611
2001	44.927
2002	44.871
2003	44.448
2004	44.305
2005	43.869
2006	42.899
2007	42.719
2008	40.708
2009	39.224
2010	36.053
2011	36.392
2012	36.952
2013	38.872
2014	38.511
2015	40.239
2016	40.681
2017	39.801
2018	40.051
2019	39.811
2020	35.97
2021	34.869
2022	31.94
2023	31.976