net cash flows provided by operating activities of $ 704.4 million for 2016 increased $ 154.7 million from 2015 due primarily to ( 1 ) improved operating performance and ( 2 ) lower supplier payments in 2016 compared to 2015 , partially offset by ( 1 ) the impact of excess tax benefits from stock plans , primarily due to our increased stock price , and ( 2 ) an increase in accounts receivable due to increased sales , primarily in the united states .net cash flows provided by operating activities of $ 549.7 million for 2015 decreased $ 472.6 million from 2014 due primarily to ( 1 ) the $ 750.0 million upfront payment received from medtronic under a litigation settlement agreement , and ( 2 ) a higher bonus payout in 2015 associated with 2014 performance .these decreases were partially offset by ( 1 ) income tax payments of $ 224.5 million made in 2014 related to the medtronic settlement , ( 2 ) improved operating performance in 2015 , and ( 3 ) the $ 50.0 million charitable contribution made in 2014 to the edwards lifesciences foundation .net cash used in investing activities of $ 211.7 million in 2016 consisted primarily of capital expenditures of $ 176.1 million and $ 41.3 million for the acquisition of intangible assets .net cash used in investing activities of $ 316.1 million in 2015 consisted primarily of a $ 320.1 million net payment associated with the acquisition of cardiaq , and capital expenditures of $ 102.7 million , partially offset by net proceeds from investments of $ 119.6 million .net cash used in investing activities of $ 633.0 million in 2014 consisted primarily of net purchases of investments of $ 527.4 million and capital expenditures of $ 82.9 million .net cash used in financing activities of $ 268.5 million in 2016 consisted primarily of purchases of treasury stock of $ 662.3 million , partially offset by ( 1 ) net proceeds from the issuance of debt of $ 222.1 million , ( 2 ) proceeds from stock plans of $ 103.3 million , and ( 3 ) the excess tax benefit from stock plans of $ 64.3 million .net cash used in financing activities of $ 158.6 million in 2015 consisted primarily of purchases of treasury stock of $ 280.1 million , partially offset by ( 1 ) proceeds from stock plans of $ 87.2 million , and ( 2 ) the excess tax benefit from stock plans of $ 41.3 million .net cash used in financing activities of $ 153.0 million in 2014 consisted primarily of purchases of treasury stock of $ 300.9 million , partially offset by ( 1 ) proceeds from stock plans of $ 113.3 million , and ( 2 ) the excess tax benefit from stock plans of $ 49.4 million ( including the realization of previously unrealized excess tax benefits ) .a summary of all of our contractual obligations and commercial commitments as of december 31 , 2016 were as follows ( in millions ) : .
[['contractual obligations', 'payments due by period total', 'payments due by period less than1 year', 'payments due by period 1-3years', 'payments due by period 4-5years', 'payments due by period after 5years'], ['debt', '$ 825.0', '$ 2014', '$ 825.0', '$ 2014', '$ 2014'], ['operating leases', '72.6', '22.3', '24.9', '8.8', '16.6'], ['interest on debt', '30.8', '16.4', '14.4', '2014', '2014'], ['pension obligations ( a )', '6.1', '6.1', '2014', '2014', '2014'], ['capital commitment obligations ( b )', '0.6', '0.3', '0.3', '2014', '2014'], ['purchase and other commitments', '16.4', '13.7', '2.7', '2014', '2014'], ['total contractual cash obligations ( c ) ( d )', '$ 951.5', '$ 58.8', '$ 867.3', '$ 8.8', '$ 16.6']]
( a ) the amount included in 2018 2018less than 1 year 2019 2019 reflects anticipated contributions to our various pension plans .anticipated contributions beyond one year are not determinable .the total accrued benefit liability for our pension plans recognized as of december 31 , 2016 was $ 50.1 million .this amount is impacted .

Question: what percentage of total contractual cash obligations is operating leases?
Answer: 8%