10.17measuring population

crude birth/death rate
number of birth/death per 1000 of the population
rate of natural increase
produced by subtracting the death rate from the birth rate
this gives us the annual natural growth rate. -the percentage form-form country or region
Net Migration Rate: the difference between the number of persons entering and leaving a country during a year
an excess of persons entering the country is net immigration
written as a positive number
example: Canada has 5.65 migrants per 1,000 population
                United States: 2.45 (it was 3.62 in 2015)
an excess of persons leaving the country is net emigration
written as a negative number
example: Mexico has -1.68 migrants per 1,000 population
                               -3.61 two years ago, -3.11 last year

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