The Australian government controls the exclusive economic zone (EEZ) and revenue from it extending 200 nautical miles (370 km) around Norfolk Island (roughly 428,000km2) and territorial sea claims to three nautical miles (6 km) from the island. There is a strong belief on the island that some of the revenue generated from Norfolk's EEZ should be available to providing services such as health and infrastructure on the island, which the island has been responsible for, similar to how the Northern Territory is able to access revenue from their mineral resources. The exclusive economic zone provides the islanders with fish, its only major natural resource. Norfolk Island has no direct control over any marine areas but has an agreement with the Commonwealth through the Australian Fisheries Management Authority (AFMA) to fish "recreationally" in a small section of the EEZ known locally as "the Box". While there is speculation that the zone may include oil and gas deposits, this is not proven. There are no major arable lands or permanent farmlands, though about 25 per cent of the island is a permanent pasture. There is no irrigated land. The island uses the Australian dollar as its currency.
Try to answer this question if possible (otherwise reply "unanswerable"): What is Norfolk Island's only resource?
unanswerable