The natural increase rate (NIR) is the difference between birth rates and death rates within a population. It represents the rate at which a population grows without considering migration.
Related terms
Birth rate: The number of live births per 1,000 individuals in a population within a given year.
Death rate: The number of deaths per 1,000 individuals in a population within a given year.
Population growth rate: This refers to the overall growth or decline of a population over time, taking into account both natural increase (births minus deaths) and net migration.