335There shall be filed with the Superintendent by the attorney, as often as the Superintendent requires, a statement of the attorney under oath showing, in the case of fire insurance, the maximum amount of indemnity upon any single risk and a statement of the attorney, verified by oath, to the effect that he has examined the commercial rating of the subscribers of the exchange as shown by the reference book of a commercial agency, having at least five hundred subscribers, and that from such examination or other information in his possession it appears that no subscriber has assumed on any single risk an amount greater than ten per cent of the net worth of such subscriber.