Map of the natural increase of the world population

These maps shows the evolution of the growth of the world's population between the years 1950-2009 and 1950-2010:

Natural population change refers to increase and dicrease in population produced by biological factors (like births and deaths):
Natality: number of births that take place on a population over a year.
Mortality: number of deaths that take place in a population over a year.
Natural increase: number of births minus the number of deaths.
Real growth = Natality-Mortality+Immigration-Emigration