People are answering with basic math, but they still miss the basic fact that most people are not having kids in a year. Your math assumes that everyone is having 2-3 kids all at once, but a majority of people are not of age to have kids (children and the elderly), and the vast majority of reproductive-age people are not having kids in a year. A couple who has 2 kids has them over a few years, then they stop forever. The contribution of existing people to population growth is punctual and short-lived.
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