Year % of male working-age population with basic education 1998 37.36 1999 35.059 2000 33.256 2001 30.094 2002 29.849 2003 32.766 2004 29.321 2005 26.172 2006 25.125 2007 26.284 2008 21.999 2009 21.633 2010 20.186 2011 20.429 2012 20.566 2013 22.445 2014 24.078 2015 24.238 2016 23.634 2017 25.339 2018 26.487 2019 26.781 2020 28.502 2021 31.352 2022 30.468 2023 31.249