1970 Ranking
    1. Lesotho 78.03
    2. El Salvador 71.29
    3. Nicaragua 70.20
    4. Guatemala 69.03
    5. Paraguay 60.32
    6. Colombia 59.81
    7. Botswana 50.35
    8. Swaziland 49.44
    9. Tanzania 41.11
    10. Argentina 36.38
    11. Costa Rica 28.82
    12. Chile 22.72
    13. Uruguay 16.09
    14. Panama 14.40
    15. Seychelles 9.57
    2017 Ranking
    1. Ghana 18.41
    2. Kazakhstan 0.82

    Proportion of pupils from a cohort enrolled in the last grade in a given school year who are no longer enrolled in the following school year.

    Source: UNESCO