Each such corporation shall annually, on or before March first, file in the office of the Insurance Commissioner a statement, verified by at least two of its principal officers, showing its condition on the thirty-first day of December then next preceding, which shall be in such form and contain such information as said commissioner prescribes. Examination of the financial condition of each such corporation by the Insurance Commissioner or his representatives shall be made at least once in every five years. Said commissioner, or any deputy or examiner or any other person whom he appoints, shall have the power of visitation and examination into the affairs of any such corporation and free access to all of the books, papers and documents that relate to the business of the corporation, and may summon and qualify as witnesses under oath, for the purpose of examination, its officers, agents or employees or other persons in relation to the affairs, transactions and conditions of the corporation. All costs of acquisition and of management activities shall be under the supervision of the Insurance Commissioner.