Papua New Guinea has more languages than any other country, with over 820 indigenous languages, representing 12% of the world's total, but most have fewer than 1,000 speakers. With an average of only 7,000 speakers per language, Papua New Guinea has a greater density of languages than any other nation on earth except Vanuatu. The most widely spoken indigenous language is Enga, with about 200,000 speakers, followed by Melpa and Huli. Indigenous languages are classified into two large groups, Austronesian languages and non-Austronesian, or Papuan, languages. There are four languages in Papua New Guinea with some statutory recognition: English, Tok Pisin, Hiri Motu, and, since 2015, sign language (which in practice means Papua New Guinean Sign Language).