YearPToutPBase 100
201190.34%100
201292.33%100.2
201389.94%100.4
201494.24%100.6
201593.68%100.8
201693.07%101
201796.61%101.2
201891.82%101.4
2019100%101.6
202092.79%101.8
202188.29%102
Evolution : 2 % entre 2011 et 2021 soit 0.18 % de gain par an.