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ID, Except for a few new classifications added to the rate schedules in 1942 and 1946, and a rate schedule for private swimming pools in 1949, the present rates are those made effective by the Public Service Commission on September 1 , 1931. All rates have been approved by the Public Service Commission. Very little change in revenue per customer occurs under a flat-rate system without a change in the rates themselves. With no change in rates since 1931, the range in revenue per customer has been confined to very narrow limits during the last 18 years. Operating revenue per customer and other pertinent statistics are shown in the following tabulation covering the period 1938-1949; Year Average No. of Customers Annual Revenue per Customer Water Consumed i/ (Thousand Gallons) Consumption per Customer (Gallons) 1938 2,030 $26.75 1939 2,105 1,0256,143 510,415 1940 2 ,2 20 26.46 968,071 459^891 26.94 1,217,410 548 >83 41 2,380 27.07 1,484,688 623,818 42 3,161 28.53 1,458,086 461,274 43 4,422 26.61 1,891,694 427,791 44 5,143 25.90 2,157,749 419,551 45 5,464 26.42 2,291,623 419,404 46 5,798 27.48 2,780,617 479,582 47 6,255 28.07 3,188,676 509,780 48 6 ,9bU 27,16 3,408,414 490,419 49 7,593 26.22 3,541,353 466,397 1/ Source; Annual reports to P.S.C. of Nevada Item 4. . Page 13, Chart A graphically shows that from 1940 to 1949 the actual revenue per customer remained practically constant, while the purchas­ing power of the 1940 dollar has severely declined as shown by the de­creasing length of the vertical bars. Similarly the length of the bars greatly increases from 1940 to the present period, when their length is made proportional to the increased customer billing that would be necessary to maintain the 1940 purchasing power. At this point it is interesting to observe other changes that have been taking place and to compare the population growth of the City of Las Vegas with the customer growth of the Water Utility.