Year	% (modeled ILO estimate)
1991	55.23
1992	54.467
1993	54.163
1994	53.759
1995	52.429
1996	51.141
1997	49.877
1998	48.952
1999	48.035
2000	47.125
2001	46.222
2002	45.322
2003	44.429
2004	43.546
2005	42.671
2006	40.987
2007	41.086
2008	40.574
2009	39.567
2010	41.843
2011	42.893
2012	46.92
2013	44.634
2014	41.903
2015	39.255
2016	41.023
2017	41.047
2018	40.76
2019	40.613
2020	37.746
2021	37.939
2022	37.643
2023	38.192