During the 1860s, planters in Australia, Fiji, New Caledonia, and the Samoan islands, in need of labourers, encouraged a long-term indentured labour trade called "blackbirding". At the height of the labour trade, more than one-half the adult male population of several of the islands worked abroad. Because of this, and the poor conditions and abuse often faced by workers, as well the introduction of common diseases to which native Ni-Vanuatu had no immunity, the population of Vanuatu declined severely, with the current population being greatly reduced compared to pre-contact times. Greater oversight of the trade saw it gradually wind down, with Australia barring any further 'blackbird' labourers in 1906, followed by Fiji and Samoa in 1910 and 1913 respectively.