Year	% (modeled ILO estimate)
1991	40.464
1992	40.622
1993	40.562
1994	40.514
1995	40.374
1996	40.236
1997	40.284
1998	40.152
1999	40.083
2000	40.048
2001	39.956
2002	39.845
2003	39.612
2004	39.489
2005	39.776
2006	40.064
2007	40.329
2008	40.626
2009	40.915
2010	41.239
2011	41.524
2012	41.806
2013	42.099
2014	42.352
2015	42.232
2016	42.14
2017	42.077
2018	42.015
2019	41.884
2020	41.123
2021	41.323
2022	41.586
2023	41.69