Year	% (modeled ILO estimate)
1991	34.31
1992	35.129
1993	35.993
1994	36.117
1995	37.119
1996	37.465
1997	38.256
1998	38.823
1999	39.414
2000	39.779
2001	40.18
2002	41.05
2003	42.097
2004	42.775
2005	43.181
2006	44.031
2007	44.477
2008	44.735
2009	44.337
2010	43.826
2011	43.78
2012	44.009
2013	44.411
2014	44.57
2015	44.704
2016	44.955
2017	45.095
2018	45.314
2019	45.237
2020	43.057
2021	43.962
2022	45.148
2023	45.948