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population of pigs in the world, how many pigs in the world, a population of pigs in the wild, number of pigs in the us, global number of pigs worldwide in 2018, how many pigs in the us, how many pigs in the usa, how many pigs in the united states, us wild pig population, how many pigs in america, how many wild pigs in usa, how many people have pet pigs, how many pigs are on earth