Section 43. The department shall make an annual report including such statements, facts and explanations as will describe the actual working of the system of carriers under its supervision in its bearing upon the business and prosperity of the commonwealth, with such tables and abstracts of all the returns required and such suggestions as to its general policy or any part thereof, or the condition, affairs or conduct of the activities under its supervision as may seem appropriate, together with a report of any proceeding had under authority of section twenty-three and the result thereof.