Dependency in swedd countries, a surplus period of 36 years on average

The SWEDD zone, composed of Sahelian countries with the exception of Côte d’Ivoire has a semi-arid warm climate with alternating dry / winter season with relatively regular rainy seasons except for the parts almost entirely penetrated by the Sahara. Administratively, countries in the SWEDD zone do not have the same types of territorial divisions (13 regions in Burkina Faso, 14 districts in Côte d’Ivoire, 8 regions and 1 district in Mali, 12 wilaya and 1 district in Mauritania, 8 regions in Niger and 23 regions in Chad).