Year	% (modeled ILO estimate)
1991	36.295
1992	36.262
1993	36.113
1994	36.072
1995	35.938
1996	35.862
1997	35.786
1998	35.731
1999	35.631
2000	35.538
2001	35.699
2002	35.856
2003	35.982
2004	36.093
2005	36.183
2006	36.323
2007	36.401
2008	36.44
2009	36.445
2010	36.421
2011	36.27
2012	36.093
2013	35.907
2014	35.664
2015	35.362
2016	35.029
2017	34.618
2018	34.155
2019	33.284
2020	37.134
2021	34.627
2022	31.306
2023	31.385