Source: https://moodle.umontpellier.fr/pluginfile.php/359663/course/overviewfiles/tableaux%20et%20graphiques%20%20accompagnant%20le%20cours%20de%20d%C3%A9mographie%20%C3%A9conomique%2C%20DOSSIER%20N%C2%B01%20%28version%20provisoire%29.pdf