Year	% (modeled ILO estimate)
1991	36.17
1992	35.987
1993	35.352
1994	35.269
1995	35.82
1996	36.981
1997	37.11
1998	36.718
1999	36.27
2000	36.023
2001	36.004
2002	36.292
2003	36.23
2004	36.339
2005	36.266
2006	36.546
2007	36.621
2008	36.476
2009	36.141
2010	35.806
2011	34.463
2012	35.232
2013	35.745
2014	36.281
2015	36.57
2016	36.87
2017	37.241
2018	37.672
2019	38.183
2020	37.276
2021	38.824
2022	39.234
2023	39.195