Up until 1975 there were fewer than 700 Vietnam-born people in Australia. After the takeover of South Vietnam by the North Vietnamese communist government in April 1975, Australia, being a signatory to the "Convention Relating to the Status of Refugees", agreed to resettle its share of Vietnam-born refugees under a plan to resettle refugees between 1975 and 1985. After the early intake of refugees in the late 1970s, there was a second immigration wave in 1983–84, most likely a result of the 1982 agreement between the Australian and Vietnamese governments (the "Orderly Departure Program") which allowed relatives of Vietnamese Australians to leave Vietnam and move to Australia. A third immigration wave in the late 1980s seems to have been mainly due to Australia's family reunion scheme.