The latter area was transferred to Australia in 1902, which occupied the northern portion during World War I and continued to administer the combined areas until independence in 1975. A nine-year secessionist revolt on the island of Bougainville ended in 1997, after claiming some 20,000 lives.
Agriculture provides a subsistence livelihood for the bulk of the population.
Budgetary support from Australia and development aid under World Bank auspices have helped sustain the economy. In 1995, Port Moresby reached agreement with the IMF and World Bank on a structural adjustment program, of which the first phase was successfully completed in 1996. In 1997, droughts caused by the El Nino weather pattern wreaked havoc on Papua New Guinea's coffee, cocoa, and coconut production, the mainstays of the agricultural-based economy and major sources of export earnings.