It was estimated in 2002 that Muslims constituted 40% of the population of Africa, a fraction which has slightly decreased in the meantime due to high birth rates in Sub-Saharan Africa. According to the Encyclopædia Britannica, as of mid-2002, there were 376,453,000 Christians, 329,869,000 Muslims and 98,734,000 people who practiced traditional religions in Africa. Ian S. Markham,(A World Religions Reader. Cambridge, MA: Blackwell Publishers, 1996.) is cited by Morehouse University as giving the mid-1990s figure of 278,250,800 Muslims in Africa, but still as 40.8% of the total population. These numbers are estimates, and remain a matter of conjecture. See Amadu Jacky Kaba. The spread of Christianity and Islam in Africa: a survey and analysis of the numbers and percentages of Christians, Muslims and those who practice indigenous religions. The Western Journal of Black Studies, Vol 29, Number 2, June 2005. Discusses the estimations of various almanacs and encyclopedium, placing Britannica's estimate as the most agreed figure. Notes the figure presented at the World Christian Encyclopedia, summarized here, as being an outlier. On rates of growth, Islam and Pentecostal Christianity are highest, see: The List: The World’s Fastest-Growing Religions, Foreign Policy, May 2007.</ref> Islam has a large presence in North Africa, the Horn of Africa, Sahel, the Swahili Coast, and much of West Africa, with minority immigrant populations in South Africa.