developed by the Christian missionary group SIL International, who have translated the Bible, Christian hymns, and other materials. The General Alphabet of Cameroon Languages was developed in the late 1970s as an orthographic system for all Cameroonian languages. In the late 19th century, the Bamum script was developed by Sultan Ibrahim Njoya to write the Bamum (Shüpamom) language. Official languages Literacy in French for individuals of age 12 and above rose from 41.3% to 57.6% between 1987 and 2005 while that of English rose from 13.4% to 25.3%. The global proportion of individuals literate in official languages has thus markedly increased between 1987 and 2005, rising from 53.3% to 71.2%. In 2005, the probability to be literate in French while being anglophone was 0.46 while that of being literate in English while being francophone was 0.20, resulting from the predominant status of the French language in Cameroon as a whole. Indigenous languages Most of the 260 languages spoken in Cameroon are indigenous languages. With a population estimated in 25 million people, UNESCO classified the country as a distinctive cultural density. The National Institute of Statistics of Cameroon reported that four percent of the indigenous languages have disappeared since 1950. Currently, ten percent of them are neglected, and seven percent of them are considered as threatened. Ethnologue The following list of languages in Cameroon is mostly based from Ethnologue. ALCAM (2012) The Atlas linguistique du Cameroun (ALCAM, or "Linguistic Atlas of Cameroon") lists about 250 languages in Cameroon. The list is provided below. Classification The 2012 edition of the Atlas linguistique du Cameroun (ALCAM) provides the following classification of the Niger–Congo languages of Cameroon. Adamawa Samba Daka Kobo-Dii (Vere-Duru) North: Doyayo, Longto South: Peere Mumuye Mbum North: Tupuri, Mundang, Mambay South: Mbum, Pana, Kali-Dek, Kuo, Gbete, Pam, Ndai Fali: North, South Nimbari Ubangian Gbaya; Bangando Baka Benue-Congo Jukunoid: Mbembe, Njukun, Kutep, Uuhum-Gigi, Busua, Bishuo, Bikya, Kum, Beezen Nsaa Cross River: Korop; Efik Bendi: Boki Bantoid (see below) Bantoid Mambiloid: Njoyame, Nizaa, Mambila, Kwanja, Bung, Kamkam, Vute Tivoid: Njwande, Tiv, Iyive, Iceve, Evand, Ugare, Esimbi, Batomo, Assumbo, Eman, Caka, Ihatum, Amasi Ekoid: Ejagham Nyang: Denya, Kendem, Kenyang Beboid Western: Naki, Bu, Misong, Koshin, Muŋgɔŋ, Cuŋ Eastern: Bebe, Kemezuŋ, Ncane, Nsari, Noone, Busuu, Bishuo, Bikya Grassfield (see below) Bantu (see below) Grassfield Western Momo Ngwɔ, Widikum Menchum Modele, Befang Ring West: Aghem Central: Mmen East: Lamnso' South: Kənswei Nsei, Niemeng, Vəŋo, Wushi Eastern