Year	% (modeled ILO estimate)
1991	37.961
1992	38.089
1993	38.215
1994	38.522
1995	38.669
1996	38.697
1997	37.632
1998	42.273
1999	40.709
2000	39.161
2001	39.658
2002	40.158
2003	40.663
2004	42.978
2005	40.075
2006	40.96
2007	39.521
2008	39.226
2009	36.892
2010	33.591
2011	30.215
2012	31.374
2013	30.601
2014	28.361
2015	32.458
2016	35.212
2017	35.4
2018	33.998
2019	34.501
2020	30.575
2021	35.155
2022	36.54
2023	35.806