YearPToutPBase 100
201096.35%100
201192.7%100.1
2012100%100.3
201395.4%100.4
201499.53%100.5
201597.67%100.7
201696.53%100.8
201799.85%100.9
201897.61%101.1
201997.8%101.2
202095.36%101.3
Evolution : 1 % entre 2010 et 2020 soit 0.12 % de gain par an.