Because "current residents" also include the children and teenagers currently living there? You act like young adults are 100% flown in by storks, as if the city doesn't itself procreate, as if school children doesn't grow up into young adults.

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floxy 3 days ago | parent [-]

Any good sources showing how much various cities' fertility rate contributes to their population growth?

	▲	lotsofpulp 2 days ago \| parent [-]
		They don’t contribute, as they are all below replacement rate. https://www.newgeography.com/content/007550-total-fertility-... Probably true worldwide except maybe Africa and Middle East.