One of the earliest demographic studies in the modern period was Natural and Political Observations Made upon the Bills of Mortality (1662) by John Graunt, which contains a primitive form of life table.
Iyyat daɣ tiɣir n demography ta tazzarat daɣ azzaman wan uchray amos Natural d Political Observations ijjanen fal Bills of Mortality (1662) ijja John Graunt eha dumu aruwan n tabel n tamudre