Year	% (modeled ILO estimate)
1991	59.921
1992	60.95
1993	60.75
1994	60.251
1995	59.454
1996	56.263
1997	50.052
1998	49.88
1999	47.739
2000	45.655
2001	43.144
2002	41.668
2003	38.787
2004	40.423
2005	35.903
2006	35.108
2007	35.885
2008	35.861
2009	35.821
2010	36.649
2011	35.378
2012	35.384
2013	35.221
2014	34.954
2015	37.146
2016	34.022
2017	34.7
2018	34.657
2019	35.711
2020	35.602
2021	32.954
2022	31.694
2023	30.277