Year	% (modeled ILO estimate)
1991	42.171
1992	39.299
1993	42.647
1994	41.066
1995	39.501
1996	41.504
1997	43.317
1998	44.28
1999	42.108
2000	39.561
2001	40.015
2002	40.466
2003	41.502
2004	42.087
2005	43.788
2006	39.656
2007	36.444
2008	33.342
2009	31.915
2010	30.509
2011	29.376
2012	29.265
2013	29.165
2014	29.077
2015	28.994
2016	30.154
2017	31.569
2018	32.974
2019	34.139
2020	32.387
2021	33.14
2022	32.473
2023	32.421