The Department of Human Services, taking into consideration the total amount of funds available for public assistance in Oregon during the biennial period beginning July 1 of each odd-numbered year, the estimated number of beneficiaries in each category thereof, current and estimated costs of essential needs to maintain a standard of living during such period compatible with decency and health and such other matters as it may deem pertinent, shall estimate and allocate the funds available for each category of public assistance on a monthly basis subject to the quarterly revisions. Changes in such allocations, if any, shall be uniform and, as nearly as practicable and considering the above factors, proportionately equal in each such category. The monthly amounts so found estimated and allocated shall be deemed to be the funds available for each category for public assistance in Oregon. [Formerly 411.130]