The annual population change report breaks total population change into its parts: natural change, net migration, and ageing. Natural change is births minus deaths. Net migration is in-migration minus out-migration. Ageing captures people moving between age groups when an age filter is applied.
Each part is shown as a series on a combo chart and a row in the table. The total row adds them together to give the annual population change for each year.
This page gives a clear picture of what is driving growth or decline. If natural change is negative but net migration is strong, the area grows through people moving in. If both are negative, the population is shrinking.