Article L3334-3 of the French General Code of Local Authorities
Each département receives a lump-sum allocation. I. – From 2015, each département’s lump-sum allocation is equal to the amount received the previous year in respect of this allocation. For each department, with the exception of the department of Paris, this allocation is increased or reduced by the product of the difference between its population recorded in respect of the year of allocation and that recorded in respect of the year…