There are several types of population pyramids and are divided into four stages, which are:
Stage 1: Expanding - High CBR, rapid fall in each upward age group due to high CDR, short life expectancy.
Stage 2: Expanding - High CBR, fall in CDR as more individuals live to middle age, slightly longer life expectancy.
Stage 3: Stationary - Declining CBR, low CDR, more individuals live to old age.
Stage 4: Contracting - low CBR, low CDR, higher dependency ratio (those that cannot work), longer life expectancy.
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