Year	% of total working-age population with basic education
1999	41.055
2000	42.714
2001	50.076
2002	49.797
2003	50.789
2004	51.114
2005	49.035
2006	47.964
2007	47.268
2008	46.405
2009	46.526
2010	47.364
2011	45.341
2012	42.182
2013	40.892
2014	41.659
2015	39.352
2016	38.667
2017	35.974
2018	36.185
2019	37.31
2020	37.446
2021	36.807
2022	36.453
2023	35.226