There are 7 billion juveniles in the world Gnome? Somehow don't think so. A "massive over representation" of what? Your figures are totally meaningless.
Something like 1.9 billion of the world's population are children - not all children are abused. Figure for the reported cases of abuse of children in the world amount to what? (Top 11 countries collective number amounts to 139,200 cases of child abuse - top nation is Australia)
414,000 Catholic Clergy in the world - not all are child abusers by one hell of a long shot.