It appears to be globally, though it depends on what you count exactly (65% of the total revenues, I was off sorry, but 80% of all subscription revenues). The reality is that the hundreds of millions in poorer countries with Android spend peanuts compared to rich countries. https://www.businessofapps.com/data/app-revenues/

But whatever the exact number, the point stands. In most cases, not supporting iOS is a silly business decision.