"The World Factbook". Central Intelligence Agency. Archived from the original on 24 April 2020. Retrieved 2016-10-08., Niger: 11% of 18.6 million
"The World Factbook". Central Intelligence Agency. Archived from the original on 24 April 2020. Retrieved 2016-10-08., Burkina Faso: 1.9% of 19.5 million
web.archive.org
"The World Factbook". Central Intelligence Agency. Archived from the original on 24 April 2020. Retrieved 2016-10-08., Niger: 11% of 18.6 million
"The World Factbook". Central Intelligence Agency. Archived from the original on 24 April 2020. Retrieved 2016-10-08., Burkina Faso: 1.9% of 19.5 million