translate English to French: The proportions of the total minor vein length occupied by each are type I, 15.1%; type II, 27.2%; type III, 24.4%; and type IV, 33.3%.
Les proportions de la longueur totale des nervures mineures que chaque type occupait sont : type I, 15,1%; type II, 27,2%; type III, 24,4%; et type IV, 33,3%.