Year	% (modeled ILO estimate)
1991	48.925
1992	47.378
1993	45.518
1994	43.752
1995	42.402
1996	41.248
1997	41.189
1998	41.087
1999	40.885
2000	40.858
2001	40.706
2002	40.648
2003	41.821
2004	42.883
2005	41.436
2006	39.532
2007	38.434
2008	36.168
2009	35.553
2010	33.863
2011	33.016
2012	33.373
2013	33.273
2014	31.525
2015	31.006
2016	30.894
2017	32.283
2018	31.689
2019	31.362
2020	28.711
2021	28.013
2022	28.413
2023	28.925