Every insurer transacting marine insurance in this state shall file, on or before the first day of April in each year, with the commissioner of banking and insurance, and in the form prescribed by him, a report of all the items pertaining to its insurance business as enumerated and prescribed in sections 54:16-1 to 54:16-6 of this title.

To determine the basis of the tax on underwriting profit, every insurer which has been writing such marine insurance in this state for three years shall furnish the commissioner of banking and insurance a statement of all the aforementioned items, in the form prescribed by him, for each of the preceding three calendar years. An insurer which has not been writing such marine insurance for three years shall furnish to the commissioner of banking and insurance a statement of all the aforementioned items for each of the calendar years during which it has written such marine insurance.