Updated March 2007
The global data base of the Development Research Centre on Migration,
Globalisation and Poverty (Migration DRC) consists of a 226x226
matrix of origin-destination stocks by country and economy. The
data are generated by disaggregating the information on migrant
stock in each destination country or economy as given in its census.
The reference period is the 2000 round of population censuses,
so the data do not refer to precisely the same time period. They
are stocks not population flows in a strict sense but are, for
international migration, the equivalent of “lifetime migration” in
studies of internal migration. Four versions of the database are
currently available, giving increasing levels of completeness,
but decreasing levels of accuracy as the missing data are added
via assumption and interpolation with each successive version.
Users of the higher numbered versions should be aware of the limitations
that this imposes. The four versions are described in the table
below. In the first three versions, information is reported on
both place of birth and citizenship, compiled in separate matrices
(see tabs on each sheet), to maintain the clear distinction between
the data, which are clearly based on different concepts. Version
4 combines the two concepts to create a single complete bilateral
matrix of stocks.
In essence, the Migration DRC database extends the basic stock data
on international migration that is published by the United Nations
and is subject to the weaknesses that characterize all stock data
derived from censuses. Users need to be fully aware of these weaknesses
when drawing conclusions from the data. The Migration DRC accepts
no responsibility for the quality of the data sources.
For a detailed elaboration of the methods and limitations of the
construction of the database see the World Bank discussion paper
An earlier version of this paper is also
on the Migration DRC website here:
The four versions of the data are as follows (please click on the
links in the left column to download each spreadsheet):
of migrants treated
countries whose status is changed from previous version
|Raw data collected
including older primary sources where later information unavailable.
Meaningless "unknown" totals omitted. Those countries
where totals reported prior to break-up redistributed according
to bilateral migration stocks post break-up. Aggregated in dependences.
Entered zeros where applicable.
jointly reported nations, and those prior to break-up where no
post break-up migration data available, according to population
according to subsequent migration stats: Germany, Italy, Canada,
Denmark, Sweden, Finland
nationalities with little or no correlation to states or regions.
Added additional DFID figures on the number of Indians residing
in Middle Eastern Economies. Removed "unknown" or "ignored" categories
as these most likely accounts for domestic population and not
migrants. Removed those recorded with dual nationality.
ethnicities: Bulgaria, Romania, Slovakia, Croatia, Belarus, Kazakhstan,
Kyrgyzstan, Moldova, Turkmenistan, Tajikistan, Uzbekistan Removed
unknown and ignored figures: Argentina, Netherlands, Sweden,
Thailand, Greece, Bulgaria, Hungary Added DFID figures: Qatar,
Oman, Bahrain, Kuwait Removed dual nationality: Liechtenstein
= Total = 175.7m
|Entered United Nations data for country of birth totals
where data missing. Used entropy measure to compare nationality
and country of birth shares. Having confirmed that the
series were highly correlated, used the additional information
content in the nationality matrix to supplement the foreign-born
matrix with additional coefficients of interest.
|Disaggregated remainder categories based on countries’ propensity
to send migrants abroad.
|Used shares based on countries’ propensity to send
migrants abroad to fill all remaining bilateral coefficients.
Scaled data to United Nations (2004)
included where no data previously: China, Indonesia, Democratic
People's Republic of Korea, Morocco, Algeria, Yemen Countries
that had nationality data used to supplement FB Matrix: Japan,
Philippines, Thailand, Vietnam, Italy, Mozambique
acknowledge the source in all published materials resulting from
analysis using this database, and send a copy of such publications
to the Migration DRC.
A composite matrix based on a slightly earlier version of
these data, which uses some different assumptions to complete
the missing values, has been prepared by the Development Prospects
Group of the World Bank. See www.worldbank.org/prospects/migrationandremittances