Year	% (modeled ILO estimate)
1991	60.692
1992	59.045
1993	56.825
1994	56.297
1995	57.178
1996	56.406
1997	57.396
1998	58.366
1999	58.45
2000	59.193
2001	57.022
2002	54.824
2003	52.606
2004	50.378
2005	48.148
2006	45.925
2007	43.718
2008	41.535
2009	39.384
2010	37.273
2011	37.383
2012	37.134
2013	36.96
2014	35.88
2015	35.442
2016	35.107
2017	34.959
2018	35.185
2019	34.812
2020	34.481
2021	34.005
2022	33.788
2023	33.604