Year	% (modeled ILO estimate)
1991	57.575
1992	54.898
1993	53.803
1994	52.582
1995	51.452
1996	50.312
1997	49.236
1998	48.16
1999	45.894
2000	45.303
2001	45.09
2002	44.902
2003	44.754
2004	44.578
2005	44.366
2006	44.122
2007	42.952
2008	41.923
2009	40.738
2010	39.729
2011	40.034
2012	40.246
2013	40.319
2014	37.76
2015	35.166
2016	36.449
2017	37.915
2018	37.77
2019	37.603
2020	36.605
2021	36.559
2022	36.498
2023	36.368