"=SUMPRODUCT((R2C[-13]:R" & DernLigne & "C[-13])*(R2C[-10]:R" & DernLigne & "C[-10])*(R2C[-12]:R" & DernLigne & "C[-12]=""EUR""),N(RC[-1]=R2C[-7]:R" & DernLigne & "C[-7]))/SUMPRODUCT((R2C[-13]:R" & DernLigne & "C[-13])*(R2C[-12]:R" & DernLigne & "C[-12]=""EUR""),N(RC[-1]=R2C[-7]:R" & DernLigne & "C[-7]))"