Year	% of total working-age population with basic education
1998	29.603
1999	27.728
2000	25.94
2001	32.385
2002	34.37
2003	34.034
2004	33.436
2005	32.781
2006	36.155
2007	37.051
2008	36.865
2009	35.967
2010	34.358
2011	34.354
2012	35.745
2013	35.747
2014	36.677
2015	38.202
2016	38.121
2017	37.849
2018	37.627
2019	39.095
2020	38.859
2021	26.853
2022	30.082
2023	31.28