§ 15. Reports by employer. Each employer of labor in this state who shall have entered into the plan with any employee shall, on or before the first day of January, nineteen hundred and eleven, and thereafter and at such times as may be required by the industrial commission, make a report to such commission of all amounts, if any, paid by him under such plan to injured employees, stating the name of such employees, and showing separately the amounts paid under agreement with the employees, and the amounts paid after proceedings at law, and the proceedings at law under the plan then pending. Such reports shall be verified by the employer or a duly authorized agent in the same manner as affidavits.