Year	% (modeled ILO estimate)
1991	35.39
1992	40.221
1993	41.411
1994	41.072
1995	41.099
1996	40.738
1997	39.454
1998	39.821
1999	34.849
2000	31.88
2001	31.225
2002	33.926
2003	32.415
2004	30.717
2005	32.055
2006	34.085
2007	35.896
2008	36.601
2009	35.938
2010	37.234
2011	33.71
2012	36.193
2013	36.081
2014	35.342
2015	37.148
2016	35.965
2017	36.585
2018	34.784
2019	32.884
2020	31.595
2021	30.002
2022	33.173
2023	31.542