Every insurer shall file annually, on or before July 1, with the rating organization of which it is a member or subscriber, or with such other common agency representing a group of insurers as the department may approve, and with the department a statistical report showing a classification schedule of its premiums and its losses on all kinds of insurance to which this article is applicable, together with such other information as the department may deem necessary for the proper determination of the reasonableness and adequacy of rates. Such statistical report filed with the rating organization may be consolidated and filed by such common agency. Such data shall be kept and reports made in such manner and on such forms as may be prescribed by the commissioner. All such annual filings with the department shall be kept under lock and key, and any official or employee of the department who shall divulge the contents or permit the examination thereof, except for the purpose of properly administering the provisions of this article or upon the order of court, shall be guilty of a misdemeanor and shall be subject to a fine of not more than $50.00, and shall thereafter be ineligible to be an employee or agent of said department. A mutual fire insurance company or reciprocal fire exchange which confines its business chiefly to the insurance of sprinklered risks and which pays no commission or brokerage for the acquisition of business shall be deemed to comply with the provisions of this section if it files its statistical reports of premium deposits and losses on the basis of comprehensive coverage.