Year	% of total working-age population with basic education
1998	68.035
1999	64.062
2001	66.376
2002	67.963
2003	65.701
2004	70.434
2005	67.549
2006	65.253
2007	65.631
2008	65.777
2009	66.5
2010	64.547
2011	62.917
2012	66.932
2013	64.356
2014	62.635
2015	62.675
2016	65.685
2017	65.217