The Organisation for Economic Co-operation and Development list of most educated countries in the world.
The OECD defined a country’s adult education level as the percentage of people between the ages of 25 and 64 who have completed some kind of tertiary education in the form of a two-year degree, four-year degree or vocational program.
6. United States
5. United Kingdom
Of the 36 countries that featured on the OECD list, no African country despite anecdotal evidence of high level of tertiary education in the region.
The lowest ranked is Mexico, with just over 15% of their population regarded as being educated, the implication of this is that other countries will have below 15% educated population, this is a hard sell, given the high rate of education in Nigeria and Zimbabwe for example.