=SOMME(SI((LIGNE($B$16:$B$392)=TRANSPOSE(PETITE.VALEUR(SI(SOUS.TOTAL(3;DECALER($B$16;LIGNE($C$16:$C$392)-LIGNE($B$16);));LIGNE($C$16:$C$392));LIGNE(INDIRECT("1:"&SOUS.TOTAL(3;$B$16:$B$392))))))*(MOIS($B$16:$B$392)=LIGNES(AJ$2:AJ2))*($B$16:$B$392<>"")*(ESTNUM(AJ$16:AJ$392));(AJ$16:AJ$392)-10))