aged 45–49, 37.3 per cent had given birth to eight or more children, and for currently married women in that age group, 45.0 per cent had given birth to that many children. Religion Official statistics on religion are unavailable because religious surveys were eliminated from government census reports after 1967. Tanzania's religious field is dominated by Christianity and Islam as well as of different African traditional religions connected to ethnic customs. The word for religion in Swahili, dini, generally apply to the world religions of Christianity and Islam meaning that followers of traditional African religions are considered to be of "no religion". Religious belonging is often ambiguous, with some people adhering to multiple religious identities at the same time (for instance being Christian but also following African traditional rituals) something which suggests that religious boundaries are flexible and contextual. According to a 2014 estimate by the CIA World Factbook, 61.4% of the population was Christian, 35.2% was Muslim, 1.8% practised traditional African religions, 1.4% were unaffiliated with any religion, and 0.2% followed other religions. Nearly the entire population of Zanzibar is Muslim. Of Muslims, 16% are Ahmadiyya, 20% are non-denominational Muslims, 40% are Sunni, 20 per cent are Shia, and 4% are Sufi. Within the Christian community the Catholic Church is the largest group (51% all Christians). Among the Protestants, the large number of Lutherans and Moravians points to the German missionary past of the country, while the number of Anglicans point to the British missionary history of Tanganyika. A growing number have adopted Pentecostalism, and Adventists likewise have an increasing presence because of external missionary activities from Scandinavia and the United States, especially during the first part of the 20th century. All of them have had some influence in varying degrees from the Walokole movement (East African Revival), which has also been fertile ground for the spread of charismatic and Pentecostal groups. There are also active communities of other religious groups, primarily on the mainland, such as Buddhists, Hindus, and Bahá'ís. Languages More than 100 languages are spoken in Tanzania, making it the most linguistically diverse country in East Africa. Among the languages spoken are four of Africa's language families: Bantu, Cushitic, Nilotic, and Khoisan. There are no de jure official languages in Tanzania. Swahili is used in parliamentary debate, in the lower courts, and as a medium of instruction in primary school. English is used in foreign trade,