The main components of the population change are natural change, net migration, including the shift from the non-permanent resident population to the permanent resident population, and statistical discrepancies.
- Natural change is the difference between births and deaths.
- Net migration is the difference between immigration and emigration. The change from the non-permanent resident population to the permanent resident population is included in immigration and, therefore, in net migration.
- Statistical discrepancies are changes in population size that cannot be attributed to demographic movements.