Year	% (modeled ILO estimate)
1991	39.206
1992	35.543
1993	37.681
1994	36.045
1995	38.291
1996	34.647
1997	35.249
1998	37.295
1999	38.603
2000	39.901
2001	41.346
2002	37.747
2003	33.993
2004	35.221
2005	35.999
2006	38.668
2007	36.671
2008	36.425
2009	30.648
2010	30.573
2011	30.592
2012	29.688
2013	26.861
2014	28.325
2015	29.583
2016	27.788
2017	29.686
2018	29.901
2019	29.273
2020	24.044
2021	26.085
2022	27.132
2023	27.605