The
birth rate is the number of babies born in a year per 1,000 inhabitants. The
death rate is the number of deaths in a year per 1,000 inhabitants.
Birth rate - death rate = natural increase.
Example for the Netherlands:
Birth rate = 10 o/oo.
Death rate = 8 o/oo.
Natural increase = 10 - 8 = 2 o/oo.