Population world map.

How as the population evolves?
We study:
The birth rate: is the number of births

Fertility: the estimate of children a woman would have throughout his life

Mortality: The number of deaths
To know the real crecimento a population we have the migration.

The population can be:

 Activa :(16 - 64 years): the employed and who are unemployed.
Inactive: Those who can not work due to sickness and students.