Year	% (modeled ILO estimate)
1991	38.619
1992	38.277
1993	38.013
1994	37.807
1995	37.445
1996	37.335
1997	36.957
1998	36.771
1999	36.724
2000	36.229
2001	35.885
2002	35.976
2003	36.222
2004	36.379
2005	36.744
2006	37.071
2007	37.318
2008	37.461
2009	37.49
2010	38.046
2011	38.888
2012	39.251
2013	39.192
2014	38.996
2015	39.179
2016	39.735
2017	40.059
2018	39.763
2019	39.366
2020	36.276
2021	36.419
2022	36.116
2023	36.742