The European Council Decision states that the composition of the European Parliament shall be revised with the aim of establishing a system to allocate the seats among Member States in an objective, fair, durable and transparent way. This decision shall be revised sufficiently far in advance of the beginning of the 2019-2024 parliamentary term on the basis of an initiative of the European Parliament presented before the end of 2016 with the aim of establishing a system which in the future will make it possible, before each election to the European Parliament, to allocate the seats between Member States in an objective, fair, durable and transparent way, translating the principle of degressive proportionality, taking account of any change in the number and demographic trends in the member states’ population, as duly ascertained thus respecting the overall balance of the institutional system as laid down in the Treaties