Review of the Block Grant Formula. – The formula of the block grant, as provided above, shall be reviewed by the Intergovernmental Fiscal Policy Board five (5) years after its effectivity, and every five (5) years thereafter to consider, among others, the fiscal needs of the Bangsamoro Government and the actual revenues it shall be able to generate and to ensure that all block grant expenditures are transparent and performance-based: Provided, That if the National Government shall no longer have any representative in the Intergovernmental Fiscal Policy Board, the review shall be undertaken by the Intergovernmental Relations Body.