Papua New Guinea, a sovereign state in Oceania, is the most linguistically diverse country in the world. According to Ethnologue, there are 840 living languages spoken in the country. In 2006, Papua New Guinea Prime Minister Sir Michael Somare stated that "Papua New Guinea has 832 living languages (languages, not dialects)." Most of these are classified as indigenous Papuan languages, which form a diverse sprachbund across the island of New Guinea. There are also many Austronesian languages spoken in Papua New Guinea, most of which are classified as Western Oceanic languages, as well as some Admiralty Islands languages and Polynesian Ellicean–Outlier languages in a few outer islands. Since the late 19th century, West Germanic languages — namely English and German — have also been spoken and adapted into creoles such as Tok Pisin, Torres Strait Creole and Unserdeutsch. Languages with statutory recognition are Tok Pisin, English, Hiri Motu, and Papua New Guinean Sign Language. Tok Pisin, an English-based creole, is the most widely spoken, serving as the country's lingua franca. Papua New Guinean Sign Language became the fourth officially recognised language in May 2015, and is used by the deaf population throughout the country. English is a language of Papua New Guinea and is used by the government, courts, and the education system. In the 2011 census, 39.9% of the population was literate in English. From 1884 to 1914, the northern half of the present-day country was a German colony known as German New Guinea, in which German was the official language. Tok Pisin derives some vocabulary from German as a result of this influence. Today however, German is not a generally spoken language in Papua New Guinea. Unserdeutsch, a German-based creole language, still survives in the Manus Province. Unserdeutsch Unserdeutsch, or Rabaul Creole German, is a German-based creole language spoken mainly in East New Britain Province. It is the only creole language that has developed from colonial German.