The list of Eurostat migration-related tables provides details on the Eurostat data which the Knowledge Centre for Migration & Development focuses on.
The International Migration database presents data showcasing flows and stocks of the total immigrant population and immigrant labour force; together with data on acquisition of nationality.
There are three sources for the data: national statistics offices; Eurostat and the United Nations.
Four types of sources are used: population registers; residence permits; labour force surveys and censuses. In countries that have a population register and in those that use residence permit data; stocks and flows of immigrants are most often calculated using the same source. There are exceptions; however; as some countries instead use census or labour force survey data to estimate the stock of the immigrant population. In studying stocks and flows; the same problems are encountered whether population register or permit data are used (in particular; the risk of underestimation when minors are registered on the permit of one of the parents or if the migrants are not required to have permits because of a free movement agreement). To this must be added the difficulty of purging the files regularly to eliminate permits that have expired.
The index evaluates policy efforts against human trafficking in the three prime areas of prosecution; protection and prevention (3Ps) worldwide.
The Commitment to Development Index ranks 27 of the world’s richest countries on policies that affect the more than five billion people living in poorer nations.