§ Return ordered, "showing for the Telephone Trunk System for each of the past ten years (1) the total number of calls; (2) the total number of trunk lines; (3) the total mileage; (4) the average duration per call; (5) the average number of calls per trunk per day; (6) the average number of calls per trunk per busy hour; (7) the total number of trunk operators, including all supervisors, record operators, and clerks in charge; (8) the average number of calls per operator per day; (9) the average cost for operating per call; and, in cases where definite figures in respect of the above are not available for estimates, based on the best information at the disposal of the Post Office Department"—[Mr. Goldman.]