The statistics never consider a multilingual society. As part of multilingual family myself it is a bit disingenuous to speak of mother tongue when people speak more than one language from infancy.OT.
I’m Indian. Almost everyone that goes to school in India speaks English. Well. Sure it’s not their first language. But damn close. Not at all like ESL.
Grammatically more sound than many Americans. And no, the ones at the call centers are not all named ‘Bob’.
During two decades of working with Indians the English grammar was invariably better than typical among many ’native speakers’. Anybody who ever lived in India would not doubt that there are more childhood English speakers in India than there are people in the US.