The Cook Islands are a group of fifteen small islands situated in the Polynesian part of the Pacific. They are named after the British explorer Captain Cook. The islands became a British protectorate in 1888, and came under administrative control of New Zealand in 1900. In 1965 the Cook Islanders opted for self-government in free association with New Zealand. The economy of the Cook Islands is based on agriculture and some small industries. Copra and citrus fruit are the main export products. Many skilled people emigrate to New Zealand or elsewhere. The population is predominantly Protestant. The largest church is the Cook Islands Christian Church. The Cook Islands have a Religious Advisory Council which besides the Protestants, Catholics and Pentecostals, also includes the Mormons.