Year	% (modeled ILO estimate)
1991	48.606
1992	39.526
1993	34.385
1994	31.859
1995	29.467
1996	27.932
1997	31.464
1998	32.711
1999	35.064
2000	35.221
2001	36.238
2002	35.467
2003	35.836
2004	36.209
2005	40.557
2006	42.182
2007	44.648
2008	44.733
2009	39.635
2010	38.876
2011	40.443
2012	41.855
2013	41.547
2014	41.416
2015	40.518
2016	41.697
2017	42.55
2018	44.055
2019	44.688
2020	41.156
2021	43.878
2022	46.295
2023	46.289