Year	% (modeled ILO estimate)
1991	39.305
1992	39.128
1993	39.088
1994	38.955
1995	39.349
1996	39.787
1997	40.204
1998	40.647
1999	41.077
2000	40.98
2001	40.824
2002	40.679
2003	40.484
2004	40.303
2005	40.119
2006	39.886
2007	39.633
2008	39.344
2009	39.072
2010	38.83
2011	37.528
2012	36.408
2013	35.261
2014	34.317
2015	26.409
2016	26.385
2017	26.434
2018	26.934
2019	27.144
2020	25.959
2021	26.121
2022	26.721
2023	26.805