Why you're calculating education attainment against the whole population aged 15+, and not for school age population only? School age data is much more relevant & is very compelling in showing XJ's EXCEPTIONAL improvement especially for Uyghur students. 
https://twitter.com/lymanstoneky/status/1395036852210515971
HS enrollment increased 32%, jumped from falling behind to leading the nation. In four (Uyghur majority) southern XJ prefectures, middle school graduates entering HS increased from 38% in 2009 to 84% in 2014 and 98.6% today. A 60% increase!
Also, minority students took up only 60% of the student body in 2010, and increased to 77.5% in 2019. This is another evidence showing how minority students were falling behind in education and quickly caught up with Han students in the past 10 years.
Note: in the first graph
Enrollment rate = (# students enrolled in HS) / (population aged 15 - 18). Admission rate = (# students entering HS) / (# students graduated from middle school)
Enrollment rate = (# students enrolled in HS) / (population aged 15 - 18). Admission rate = (# students entering HS) / (# students graduated from middle school)
Southern XJ: gov.cn/xinwen/2019-03… xinhuanet.com/politics/2015-…
Other XJ data: 新疆维吾尔自治区教育事业发展统计公报
National: 全国教育事业发展统计公报
Other XJ data: 新疆维吾尔自治区教育事业发展统计公报
National: 全国教育事业发展统计公报
Better shot of first graph
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