YearPToutPBase 100
201196.04%100
201298.28%100.2
201396.37%100.4
201498.2%100.6
201598.47%100.8
201699.72%101
2017100%101.3
201897.22%101.5
201996.9%101.7
202098.74%101.9
202199.9%102.1
Evolution : 2 % entre 2011 et 2021 soit 0.19 % de gain par an.