Year	% (modeled ILO estimate)
1991	57.132
1992	55.675
1993	55.236
1994	53.326
1995	51.173
1996	50.871
1997	50.372
1998	49.636
1999	48.017
2000	46.384
2001	44.345
2002	44.272
2003	44.364
2004	43.829
2005	42.91
2006	41.619
2007	40.85
2008	38.747
2009	38.089
2010	35.327
2011	35.706
2012	36.297
2013	37.76
2014	37.747
2015	39.07
2016	39.43
2017	38.087
2018	39.127
2019	39.101
2020	35.294
2021	34.301
2022	31.364
2023	31.348