in november 2016 , we issued $ 45 million of fixed rate term notes in two tranches to two insurance companies .principal payments commence in 2023 and 2028 and the notes mature in 2029 and 2034 , respectively .the notes carry interest rates of 2.87 and 3.10 , respectively .we used proceeds of the notes to pay down borrowings under our revolving credit facility .in january 2015 , we issued $ 75 million of fixed rate term notes to an insurance company .principal payments commence in 2020 and the notes mature in 2030 .the notes carry an interest rate of 3.52 percent .we used proceeds of the notes to pay down borrowings under our revolving credit facility .at december 31 , 2016 , we had available borrowing capacity of $ 310.8 million under this facility .we believe that the combination of cash , available borrowing capacity and operating cash flow will provide sufficient funds to finance our existing operations for the foreseeable future .our total debt increased to $ 323.6 million at december 31 , 2016 compared with $ 249.0 million at december 31 , 2015 , as our cash flows generated in the u.s were more than offset by our share repurchase activity and our purchase of aquasana .as a result , our leverage , as measured by the ratio of total debt to total capitalization , was 17.6 percent at the end of 2016 compared with 14.7 percent at the end of 2015 .our u.s .pension plan continues to meet all funding requirements under erisa regulations .we were not required to make a contribution to our pension plan in 2016 but made a voluntary $ 30 million contribution due to escalating pension benefit guaranty corporation insurance premiums .we forecast that we will not be required to make a contribution to the plan in 2017 and we do not plan to make any voluntary contributions in 2017 .for further information on our pension plans , see note 10 of the notes to consolidated financial statements .during 2016 , our board of directors authorized the purchase of an additional 3000000 shares of our common stock .in 2016 , we repurchased 3273109 shares at an average price of $ 41.30 per share and a total cost of $ 135.2 million .a total of 4906403 shares remained on the existing repurchase authorization at december 31 , 2016 .depending on factors such as stock price , working capital requirements and alternative investment opportunities , such as acquisitions , we expect to spend approximately $ 135 million on share repurchase activity in 2017 using a 10b5-1 repurchase plan .in addition , we may opportunistically repurchase an additional $ 65 million of our shares in 2017 .we have paid dividends for 77 consecutive years with payments increasing each of the last 25 years .we paid dividends of $ 0.48 per share in 2016 compared with $ 0.38 per share in 2015 .in january 2017 , we increased our dividend by 17 percent and anticipate paying dividends of $ 0.56 per share in 2017 .aggregate contractual obligations a summary of our contractual obligations as of december 31 , 2016 , is as follows: .
[['( dollars in millions ) contractual obligations', '( dollars in millions ) total', '( dollars in millions ) less than1 year', '( dollars in millions ) 1 - 2years', '( dollars in millions ) 3 - 5years', 'more than5 years'], ['long-term debt', '$ 323.6', '$ 7.2', '$ 7.2', '$ 202.9', '$ 106.3'], ['fixed rate interest', '38.6', '4.6', '8.1', '7.2', '18.7'], ['operating leases', '37.4', '19.5', '7.9', '4.2', '5.8'], ['purchase obligations', '150.8', '141.4', '5.8', '3.6', '2014'], ['pension and post-retirement obligations', '66.0', '0.9', '9.5', '8.6', '47.0'], ['total', '$ 616.4', '$ 173.6', '$ 38.5', '$ 226.5', '$ 177.8']]
as of december 31 , 2016 , our liability for uncertain income tax positions was $ 4.2 million .due to the high degree of uncertainty regarding timing of potential future cash flows associated with these liabilities , we are unable to make a reasonably reliable estimate of the amount and period in which these liabilities might be paid .we utilize blanket purchase orders to communicate expected annual requirements to many of our suppliers .requirements under blanket purchase orders generally do not become committed until several weeks prior to our scheduled unit production .the purchase obligation amount presented above represents the value of commitments that we consider firm .recent accounting pronouncements refer to recent accounting pronouncements in note 1 of notes to consolidated financial statements. .

Question: what percentage of total aggregate contractual obligations is due to pension and post-retirement obligations?
Answer: 11%