Formulas Used To Calculate Demographic Growth
To the right of each year column (except for the initial 1950 one), a percentage figure is shown, corresponding to the average annual growth for each previous five-year period. Thus, the figures after the 1960 column calculates the percentage for the 1955-60 period, the ones after the 1980 one, the value for 1975-80, and so on.
The formulas used to carry out these last calculations, are the standard ones, used both by the United Nations Statistics Division and by National Census Offices worldwide. They correspond to the exponential geometrical growth, and have the following general form:, where and stand for the initial and final population, respectively, within a stated time period. The same criteria applies to and, the two variables indicating the two years involved. In terms of natural logarithms, both formulas can be expressed as follows: . For the practical purposes of the calculations shown here, where five-year periods are involved, we can simplify the formulas, leaving them like this: and
Read more about this topic: List Of Countries By Past And Future Population
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