compared to earlier levels . the pre-tax non-cash impairments of certain mineral rights and real estate discussed above under the caption fffdland and development impairments fffd are not included in segment income . liquidity and capital resources on january 29 , 2018 , we announced that a definitive agreement had been signed for us to acquire all of the outstanding shares of kapstone for $ 35.00 per share and the assumption of approximately $ 1.36 billion in net debt , for a total enterprise value of approximately $ 4.9 billion . in contemplation of the transaction , on march 6 , 2018 , we issued $ 600.0 million aggregate principal amount of 3.75% ( 3.75 % ) senior notes due 2025 and $ 600.0 million aggregate principal amount of 4.0% ( 4.0 % ) senior notes due 2028 in an unregistered offering pursuant to rule 144a and regulation s under the securities act of 1933 , as amended ( the fffdsecurities act fffd ) . in addition , on march 7 , 2018 , we entered into the delayed draw credit facilities ( as hereinafter defined ) that provide for $ 3.8 billion of senior unsecured term loans . on november 2 , 2018 , in connection with the closing of the kapstone acquisition , we drew upon the facility in full . the proceeds of the delayed draw credit facilities ( as hereinafter defined ) and other sources of cash were used to pay the consideration for the kapstone acquisition , to repay certain existing indebtedness of kapstone and to pay fees and expenses incurred in connection with the kapstone acquisition . we fund our working capital requirements , capital expenditures , mergers , acquisitions and investments , restructuring activities , dividends and stock repurchases from net cash provided by operating activities , borrowings under our credit facilities , proceeds from our new a/r sales agreement ( as hereinafter defined ) , proceeds from the sale of property , plant and equipment removed from service and proceeds received in connection with the issuance of debt and equity securities . see fffdnote 13 . debt fffdtt of the notes to consolidated financial statements for additional information . funding for our domestic operations in the foreseeable future is expected to come from sources of liquidity within our domestic operations , including cash and cash equivalents , and available borrowings under our credit facilities . as such , our foreign cash and cash equivalents are not expected to be a key source of liquidity to our domestic operations . at september 30 , 2018 , excluding the delayed draw credit facilities , we had approximately $ 3.2 billion of availability under our committed credit facilities , primarily under our revolving credit facility , the majority of which matures on july 1 , 2022 . this liquidity may be used to provide for ongoing working capital needs and for other general corporate purposes , including acquisitions , dividends and stock repurchases . certain restrictive covenants govern our maximum availability under the credit facilities . we test and report our compliance with these covenants as required and we were in compliance with all of these covenants at september 30 , 2018 . at september 30 , 2018 , we had $ 104.9 million of outstanding letters of credit not drawn cash and cash equivalents were $ 636.8 million at september 30 , 2018 and $ 298.1 million at september 30 , 2017 . we used a significant portion of the cash and cash equivalents on hand at september 30 , 2018 in connection with the closing of the kapstone acquisition . approximately 20% ( 20 % ) of the cash and cash equivalents at september 30 , 2018 were held outside of the u.s . at september 30 , 2018 , total debt was $ 6415.2 million , $ 740.7 million of which was current . at september 30 , 2017 , total debt was $ 6554.8 million , $ 608.7 million of which was current . cash flow activityy .
what percent of the increase in net cash from operations between 2016 and 2017 was due to working capital changes?
net cash provided by operating activities during fiscal 2018 increased $ 520.4 million from fiscal 2017 primarily due to higher cash earnings and lower cash taxes due to the impact of the tax act . net cash provided by operating activities during fiscal 2017 increased $ 212.1 million from fiscal 2016 primarily due to a $ 111.6 million net increase in cash flow from working capital changes plus higher after-tax cash proceeds from our land and development segment fffds accelerated monetization . the changes in working capital in fiscal 2018 , 2017 and 2016 included a .