The purpose of sections 72A.17 to 72A.32 is to regulate trade practices in the business of insurance in accordance with the intent of Congress as expressed in the Act of Congress of March 9, 1945 (Public Law 15, 79th Congress), by defining, or providing for the determination of, all such practices in this state which constitute unfair methods of competition or unfair or deceptive acts or practices and by prohibiting the trade practices so defined or determined.