This is a list of countries by net migration rate, the difference between the number of persons entering and leaving a country during the year, per 1,000 persons (based on midyear population).
Method
An excess of persons entering the country is referred to as net immigration (e.g., 3.56 migrants/1,000 population); an excess of persons leaving the country as net emigration (e.g., -9.26 migrants/1,000 population). The net migration rate indicates the contribution of migration to the overall level of population change. The net migration rate does not distinguish between economic migrants, refugees, and other types of migrants nor does it distinguish between lawful migrants and unlawful migrants.
References
List of countries by net migration rate Wikipedia(Text) CC BY-SA