Fig. 4. Social inequality: Gap of the mean years of schooling between males and females in different provinces (unit: year).

During the past decades, the gender gap of the mean years of schooling in different provinces decreased significantly. The gender gaps of the mean years of schooling were less than 1 year for most of the provinces in 2016. Note that the data were derived from China Population and Employment Statistics Yearbook (1994–2017).