Year	% (modeled ILO estimate)
1991	42.789
1992	42.263
1993	42.098
1994	41.854
1995	40.851
1996	39.85
1997	38.853
1998	37.96
1999	37.071
2000	36.189
2001	35.314
2002	34.446
2003	33.586
2004	32.735
2005	31.894
2006	30.641
2007	31.038
2008	30.784
2009	29.626
2010	31.211
2011	32.012
2012	35.185
2013	33.269
2014	31.037
2015	28.889
2016	31.019
2017	30.335
2018	30.14
2019	30.042
2020	27.879
2021	28.098
2022	28.018
2023	28.472