Languages of African origin in Côte d'Ivoire belong to four main linguistic groups: Akan and Krou in the south of the country, Mandé and Voltaic in the north; there are 66 indigenous languages and a total of 112 languages. Dioula (the Mandinka language) is the main language of commerce and is used for this purpose by 70% of the population but is the mother tongue of only 14.8% of the population. The language is closely related to Malinké and Bambara. The other most important indigenous languages are Senoufo (Gour), Baoulé (Akan) and Bété (Krou). Other languages such as Yacouba and Agni are also important. These six ethnic groups alone represent most Ivorians. In addition, the Dioula language is used by most traders (Marchés), who are often illiterate. Other languages include Gouro, Krou (including Neyo, Dida, Nyabwa and Wé, known as Krahn in Liberia) and Kwa (such as Abé, Abouré, Abron, Adjoukrou and Avikam). Many of the country's inhabitants also speak French, the official state language.