1. http://hdr.undp.org/en/content/human-development-index-hdi-table
http://www.un.org/en/databases/
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i. Mean years of schooling: Average number of years of education received by people aged 25 and older, converted from education attainment levels using official durations of each level.
ii. Expected years of schooling: Number of years of schooling that a child of school entrance age can expect to receive if prevailing patterns of age-specific enrolment rates persist throughout the child’s life.