Year	% (modeled ILO estimate)
1991	29.922
1992	30.066
1993	30.071
1994	30.113
1995	30.116
1996	30.126
1997	30.297
1998	30.351
1999	30.483
2000	30.67
2001	30.79
2002	30.915
2003	30.934
2004	31.005
2005	30.993
2006	30.981
2007	30.952
2008	30.951
2009	30.947
2010	30.975
2011	30.975
2012	30.975
2013	30.986
2014	30.967
2015	30.977
2016	30.986
2017	31.037
2018	31.107
2019	31.139
2020	30.577
2021	30.85
2022	30.798
2023	30.915