সাতকাহন

Seven trashes collected by the senses.

Demographic transition

I’ve been looking through the UN population database, and will be posting some interesting (at least to me) charts in this series.  This first instalment is about population pyramid. 

This is how the pyramid looked in 1950 — the earliest datapoint.

Obviously this was a very young country — over two-fifths of the people were under 15.  Another quarter was between 15 and 29.  A fifth were ‘prime working age’ — 30 to 54.  The mature aged (45-59) were merely a tenth. 

সাতকাহন

Seven trashes collected by the senses.