Refer to An increase in the number of people that reside within a country, state, or city, that is, increase in the number (size) of people who inhabit a territory or state.
To determine whether there has been population growth, the following formula is used: Population Growth = (birth rate + immigration) - (death rate + emigration).
Births (B), deaths (D), immigration rate (I), and emigration rate (E) are the four factors determine population growth (change) for a given geographical area (country or state). Births add new individuals to a population whereas deaths remove individuals from a population. Similarly, immigration into a population adds new individuals whereas emigration out of a population removes individuals.
Population growth rate is the average annual rate of change in population size during a specified period, usually expressed in percentage to measure how fast the size of population is changing. The units of population growth rate are individuals per time. Population growth rates are positive when more individuals are added to a population than are removed, negative when more individuals are removed than are added, and are equal to zero when an equal number of individuals are added and removed. This population size is known as the carrying capacity and is the size beyond which no significant increase can occur due to limitations of some type, e.g., food, water, sunlight, space.
POPULATION GROWTH TREND IN THE LEAST DEVELOPED COUNTRIES IN RELATION TO POVERTY.
Growth is expected to be particularly dramatic in the least developed countries of the world, which are projected to double in size from 898 million inhabitants in 2013 to 1.8 billion in 2050 and to 2.9 billion in 2100. High population growth rates prevail in many developing countries, most of which are on the UN’s list of 49 least developed countries. Between 2013 and 2100, the populations of 35 countries could triple or more. Among them, the populations of Burundi, Malawi, Mali, Niger, Nigeria, Somalia, Uganda, United Republic of Tanzania and Zambia are projected to increase at least five-fold by 2100.
Tanzania (case study) is a low-income Sub-Saharan African nation, defined by the World Bank as one with a per capita income of $370 or less, and Kenya is a middle-income Sub-Saharan African nation with a per capita income exceeding $370, Tanzania and Kenya are similar in total population, being the fourth and fifth most populous nations in Sub-Saharan Africa (Nigeria ranks first with a population of 82.6 million; Ethiopia, second, with a population of 30.9 million; Zaire, third, with a population of 27.5 million; Tanzania and Sudan essentially tying for fourth place with populations of 18 million and 17.9 million, respectively; and Kenya, fifth, with a population of 15.3 million, its closest competitors being Uganda with a population of 12.8 million and Ghana with a population of 11.3 million).