Burkina Faso is an ethnically integrated, secular state where most people are concentrated in the south and centre, where their density sometimes exceeds . Hundreds of thousands of Burkinabè migrate regularly to Ivory Coast and Ghana, mainly for seasonal agricultural work. These flows of workers are affected by external events; the September 2002 coup attempt in Ivory Coast and the ensuing fighting meant that hundreds of thousands of Burkinabè returned to Burkina Faso. The regional economy suffered when they were unable to work.