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Most of the data published in this annex are taken from the individual contributions of national correspondents appointed by the OECD Secretariat with the approval of the authorities of member countries. Consequently, these data have not necessarily been harmonised at international
level. This network of correspondents, constituting the Continuous Reporting System on Migration (SOPEMI), covers most OECD member countries as well as the Baltic States, Bulgaria and Romania. SOPEMI has no authority to impose changes in data collection
procedures. It has an observatory role which, by its very nature, has to use existing statistics. However, it does play an active role in suggesting what it considers to be essential improvements in data collection and makes every effort to present consistent
and well‐documented statistics.