Not sure if /sci/ knows, but Lynn has published a new paper on IQ, meant partly to fix the issues with his monumental work in 2002 as well as update it. This was actually published in 2019 but I still see people quote 2002. This is probably because the infographics are all quoting 2002. I urge anyone who has the time to update them and cite the full name "Richard Lynn Intelligence of Nations (2019)" so people stop citing outdated sources. See pic rel or for better quality see https://worldpopulationreview.com/country-rankings/average-iq-by-country

I'd also like to address what Lynn does since some people seem not to know. Most of his work is compiling recorded IQs from studies often tangentially related to IQ itself but where collecting IQ data was necessary for the study. Then he will account for different factors and give an IQ for that country after weighing and averaging all the studies. For example Sweden:

>2.3.111. Sweden (SWE)
>An IQ-measurement in Stockholm on a sample with a mean age of 20.00y was reported by Buj (1981, Table 1). The used test was the CFT and the uncor. IQ 105.80. After a reduction by 7.28 for FEcorrection and by 2.50 for country-correction this resulted in a cor. IQ of 96.02.
>Georgas et al. (2003, Figure 19.6) gave an IQ measured in the areas of Stockholm and Uppsala of 102.00. After a reduction by 4.76 for FE-correction and 2.50 for country-correction this resulted in a cor. IQ of 94.74.
>An unweighted national IQ of 95.38 and a weighted national IQ of 94.96 were calculated. Additionally, a SAS-IQ of 99.03 could be calculated by results from all observed school assessment studies except TIMSS-1999.This resulted in a final national IQ of 97.00.

Pdf:
https://www.ulsterinstitute.org/ebook/THE%20INTELLIGENCE%20OF%20NATIONS%20-%20Richard%20Lynn,%20David%20Becker.pdf