Annual Growth Rate The rate at. which the number of individuals in a population increase in 1 year as a fraction of the initial population is called annual growth rate of population. Effects of Birth Rate on Annual Growth Rate.
The annual growth rate is affected by the birth rate in the following ways
(i) With the increase in birth rate, the annual growth rate generally increases.
(ii) For a larger population, even a lower birth rate the annual growth rate keeps on increasing.
(iii) For example, since 1981 the birth rates declined rapidly, still 18.20 crore people were added to the total population in the 1990s alone. If we calculate annual growth rate based on these data it becomes very high.