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Crude Birth Rate (CBR)
Number of births per 1000 people per year
(Total number of births/total population) X 1000
Crude Death Rate (CDR)
Number of deaths per 1000 people per year
(Total number of births/total population) X 1000
Natural Increase Rate (NIR)
(CBR - CDR)/10
Doubling Time (DT)
This is the time it takes for a population to double in size.
70/NIR
Total fertility rate
The average number of births per woman of child-bearing age.