Please note: Quality of education greatly influences IQ scores, i.e. a lower average IQ is more indicative of lower access to wide-scale quality education rather than innate intelligence (see my explanation of the issue). Also, testing conditions influence results; wealthier countries are more likely to be able to afford better testing conditions for participants.
The data may be outdated for some countries (not all up-to-date statistical data was available for all countries). Because of inevitable statistical errors, isolated figures must be taken with a grain of salt.
Before using strong words in the comments, please consider: