Year	% (modeled ILO estimate)
1991	50.035
1992	47.107
1993	45.072
1994	47.26
1995	42.323
1996	39.579
1997	34.064
1998	34.835
1999	28.799
2000	29.494
2001	26.944
2002	25.36
2003	28.372
2004	29.56
2005	30.445
2006	31.309
2007	34.117
2008	35.892
2009	28.302
2010	25.252
2011	31.027
2012	32.303
2013	32.301
2014	33.255
2015	36.345
2016	37.463
2017	40.549
2018	41.745
2019	39.738
2020	35.309
2021	33.583
2022	36.513
2023	37.041