The top 5 save a few countries are all African countries.
https://www.indexmundi.com/g/r.aspx?v=31

While the fertility rate is very low in European and Asian countries, even when the country is poor as well.

I then saw the countries with the highest twin births were also all in Africa.
https://www.sciencedaily.com/releases/2011/09/110929074035.htm

The central African country of Benin has the highest national average of twinning, with a whopping 27.9 twins per 1,000 births, the researchers added.
Why do women in Africa have twins at the highest rate? Why do they seem to get pregnant easier on average?
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