Data Provider: World Bank, World Development Indicators
Data Source: United Nations Population Division, World Population Prospects
Data Name: Net Migration
Data Year: The latest data displayed are for 2012 (Data are five year estimates from July 2010 - June 2015) and was accessed from the World Bank on 6 August 2014
Data Periodicity: The data are updated annually
Data Definition: Net migration is the net total of migrants during the period, that is, the total number of immigrants less the annual number of emigrants, including both citizens and noncitizens. Data are five-year estimates. The United Nations Population Division provides data on net migration and migrant stock. Because data on migrant stock is difficult for countries to collect, the United Nations Population Division takes into account the past migration history of a country or area, the migration policy of a country, and the influx of refugees in recent periods when deriving estimates of net migration.
The data to calculate these estimates come from a variety of sources, including border statistics, administrative records, surveys, and censuses. When there is insufficient data, net migration is derived through the difference between the overall population growth rate and the rate of natural increase (the difference between the birth rate and the death rate) during the same period. Such calculations are usually made for intercensal periods.
The estimates are also derived from the data on foreign-born population - people who have residence in one country but were born in another country. When data on the foreign-born population are not available, data on foreign population - that is, people who are citizens of a country other than the country in which they reside - are used as estimates.
Data Methodology: Read more on the specific methodology for this data at the World Bank