life expectancy
the average number of years to be lived by a group of people born in the same year
High: Monaco 89.52 total 85.63men 93.58women
#42 U.S. 79.68 total 77.32men 81.97women
low Chad 49.81 total 48.64men 51.03women
measuring population
Crude birth rate: Number of births per 1000 of the population
Crude death rate: Number of death per 1000 of the population
Rate of natural increase(RNI)
Produced by subtracting the death rate from the birth rate
This gives us the annual natural growth rate in percentage form for a country or region
But don't forget about migration
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