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Where:

NIR: Natural growth rate of population;

B: Number of live births in the reference period;

D: Number of deaths in the reference period;

P: Population up to the reference time-point;

CBR: Crude birth rate;

CDR: Crude death rate.

Total growth rate of population (or "population growth rate")
reflects the increase or the decrease of the population in one period

expressed as a percentage.

In-migration rate reflects the number of people from different
territorial units (out-migration place) in-migrates to a territorial unit in
the reference period on average per 1000 population of that territorial
unit (in-migration place).

I
IR   1000
P
Where:

IR: In-migration rate;

I: Number of in-migrants in the reference period;

P: Population up to the reference time-point.
Out-migration rate reflects the number out-migrants of a

territorial unit in the reference period on average per 1000 population
of that territorial unit.

O
OR   1000
P

Where:

OR: Out-migration rate;

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