• - Net Migration Rate: the difference between the number of person's entering and leaving a country during a year

     - an excess of persons/people entering the country is net immigration

• written as a positive number (not a negative number)
• example: Canada has 5.65 migrants per 1,000 population U.S. has 2.45 ( 3.62 in 2015)

     - an excess of persons leaving the country is net emigrant

• written as a negative number
• example: Mexico has -1.68 migrants per 1,000 population
•  -3.61 two years ago, -3.11 last year