7. Niger
With over 1.270.000 km2, Niger is the largest country in the West African region. More than 80% of its land area is covered by the Sahara Desert, and it’s commonly known for its islamic population. The Republic of Niger has a population of over 17.2 million people estimated at the end of 2014. The percentage for population growth stands at 3.28% and is projected to grow by 564.160 newborns every year.