The reason is probably because the map is only showing the top 10 for each list of countries. Vietnam is probably not in the top ten for arrivals in Poland. Y

The reason is probably because the map is only showing the top 10 for each list of countries. Vietnam is probably not in the top ten for arrivals in Poland. You can easily verify this here: http://www.migrationdrc.org/research/typesofmigration/global_migrant_origin_database.html http://www.migrationdrc.org/research/typesofmigration/global...