sentences:  About half of its 200,000 citizens live abroad (chiefly in New Zealand, Australia and the United States, and also as merchant seamen), and the portion of its national income derived through expatriate remittances is one of the highest in the world.However, except for a few honorary consulates Tonga (including in Sydney and Hamburg), Tonga's diplomatic network is very limited.It does not even have a mission on any neighbouring Pacific island states.