Year	% (modeled ILO estimate)
1991	50.087
1992	50.462
1993	41.008
1994	38.685
1995	38.281
1996	36.264
1997	38.043
1998	36.451
1999	36.666
2000	35.517
2001	32.849
2002	31.14
2003	37.842
2004	36.298
2005	38.205
2006	41.788
2007	43.738
2008	42.05
2009	29.366
2010	26.352
2011	28.169
2012	31.668
2013	33.185
2014	36.483
2015	37.057
2016	33.973
2017	34.92
2018	35.405
2019	33.861
2020	32.393
2021	29.975
2022	31.303
2023	32.427