YearPToutPBase 100
201197.03%100
201298.5%100.1
201396.98%100.3
201499.57%100.4
201599.42%100.6
201699.54%100.7
2017100%100.9
201897.64%101
201999.47%101.1
202099.63%101.3
202198.39%101.4
Evolution : 1 % entre 2011 et 2021 soit 0.13 % de gain par an.