Year	% (modeled ILO estimate)
1991	35.277
1992	35.073
1993	34.237
1994	34.169
1995	34.791
1996	36.079
1997	36.252
1998	35.848
1999	35.331
2000	34.991
2001	34.992
2002	35.32
2003	35.196
2004	35.285
2005	35.233
2006	35.612
2007	35.788
2008	35.714
2009	35.352
2010	35
2011	36.376
2012	36.646
2013	36.659
2014	36.704
2015	36.484
2016	36.273
2017	36.145
2018	36.099
2019	36.167
2020	35.736
2021	37.55
2022	37.279
2023	37.681