Year	% (modeled ILO estimate)
1991	45.951
1992	45.13
1993	44.451
1994	44.062
1995	43.212
1996	42.879
1997	42.352
1998	41.438
1999	40.644
2000	40.482
2001	40.095
2002	39.745
2003	39.314
2004	39.108
2005	38.788
2006	38.473
2007	38.176
2008	37.579
2009	36.213
2010	35.927
2011	35.124
2012	33.57
2013	33.193
2014	33.356
2015	33.608
2016	33.797
2017	33.684
2018	33.652
2019	33.445
2020	32.839
2021	33.223
2022	33.486
2023	33.797