SECTION 21. That the Commission shall, on or before the first day of December in each year, make a report, which shall be transmitted to Congress, and copies of which shall be distributed as are the other reports transmitted to Congress. This report shall contain such information and data collected by the Commission as may be considered of value in the determination of questions connected with the regulation of commerce, together with such recommendations as to additional legislation relating thereto as the Commission may deem necessary; and the names and compensation of the persons employed by said Commission.