The aggregate Australian dollar net cash outflow of the fourteen largest banks is forecast to decline for a fourth year in a row, under estimates from APRA on Friday.In a measure of financial regulator involvement in core business planning of the banking sector, the NCO projection of A$387 billion in 2018 is down $13 billion from 2017 and down $23 billion from 2015.APRA invited most locally incorporated ADIs to apply for a CLF amount to take effect on 1 January 2018. Fourteen ADIs chose to apply.The CLF "is intended to be sufficient in size to compensate for the lack of sufficient high quality liquid assets - defined to be Australian Government Securities and securities issued by the borrowing authorities of the states and territories) in Australia for ADIs to meet their LCR requirements. "ADIs are required to make every reasonable effort to manage their liquidity risk through their own balance sheet management before applying for a CLF for LCR purposes", APRA said.