Population growth takes place due to natural increase and net migration ratio.
Population is calculated using population growth rate.
Population growth rate measures how the population has increased in the present year compared to the previous year increase in present year population comparing to the last year population.
Natural Growth
The difference between crude birth and crude death in a particular year is called natural growth.
Speed of the natural growth is measured by the natural growth rate.
Crude Birth
The measure that measures the number of births in a country is known as crude birth rate.
Changes in the population of Sri Lanka during last years
Significant decrease in population growth rate
Net migration is an important factor that effects population growth in recent years
Population increased by 5.2 millions from 1981 to 2007
