|University of Kentucky||College of Agriculture||Agripedia|
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Natural increase is the difference between the number of persons added to a population due to births over a given time period (e.g., 5 or 10 years) minus the number of persons who leave a population due to death.
It is expressed as an increase or a decrease per 1,000 population of the area at the start of the time period.
NATURAL INCREASE = BIRTHS - DEATHS
RATE OF NATURAL INCREASE = [(BIRTHS - DEATHS) / POPULATION] * 1,000