In the twentieth century, changes in the population number of microstates were very diversified. It is possible, however, to observe similarities in population changes. On the basis of the following two criteria a typology of population changes was developed, i.e. the population growth rate and the variability coefficient of the population growth rate. Five types of population changes were singled out: from countries with a very small population growth and a small variability coefficient to those characterised by very large values of both of the discussed criteria.
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