Using data from across the world, we estimated the speed of selection against intelligence across countries. 
There is a certain regionality to the data
Relatively atheistic north Europeans have apparently quite weak selection, while more religious areas have stronger negative selection. This is the opposite of what American data suggested when studying individuals.
This also means that there is a Matthew effect such that countries with currently high IQs are declining slower due to internal dysgenics than those who are less fortunate. The same pattern holds for country-level development.
The usual limitations apply.
Most credit goes to @jensenjeans
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