On , and thereafter at intervals coinciding with anniversary dates of Federal Energy Regulatory Commission general review of the rates and charges of the Bonneville Power Administration, the Secretary of the Interior shall recommend to the Congress any changes in the dollar limitations herein placed upon financial assistance to Pacific Northwest reclamation projects that he believes justified by changes in the cost-price levels existing on , or by other relevant changes of circumstances.December 20, 19741974-12-20July 1, 19661966-07-01