contractual commitments we have contractual obligations and commitments in the form of capital leases , operating leases , debt obligations , purchase commitments , and certain other liabilities . we intend to satisfy these obligations through the use of cash flow from operations . the following table summarizes the expected cash outflow to satisfy our contractual obligations and commitments as of december 31 , 2010 ( in millions ) : .

Table:
commitment type | 2011 | 2012 | 2013 | 2014 | 2015 | after 2016 | total
capital leases | $ 18 | $ 19 | $ 19 | $ 20 | $ 21 | $ 112 | $ 209
operating leases | 348 | 268 | 205 | 150 | 113 | 431 | 1515
debt principal | 345 | 2014 | 1750 | 1000 | 100 | 7363 | 10558
debt interest | 322 | 321 | 300 | 274 | 269 | 4940 | 6426
purchase commitments | 642 | 463 | 425 | 16 | 2014 | 2014 | 1546
pension fundings | 1200 | 196 | 752 | 541 | 274 | 2014 | 2963
other liabilities | 69 | 67 | 64 | 58 | 43 | 38 | 339
total | $ 2944 | $ 1334 | $ 3515 | $ 2059 | $ 820 | $ 12884 | $ 23556
our capital lease obligations relate primarily to leases on aircraft .
capital leases , operating leases , and purchase commitments , as well as our debt principal obligations , are discussed further in note 7 to our consolidated financial statements .
the amount of interest on our debt was calculated as the contractual interest payments due on our fixed-rate debt , in addition to interest on variable rate debt that was calculated based on interest rates as of december 31 , 2010 .
the calculations of debt interest take into account the effect of interest rate swap agreements .
for debt denominated in a foreign currency , the u.s .
dollar equivalent principal amount of the debt at the end of the year was used as the basis to calculate future interest payments .
purchase commitments represent contractual agreements to purchase goods or services that are legally binding , the largest of which are orders for aircraft , engines , and parts .
as of december 31 , 2010 , we have firm commitments to purchase 20 boeing 767-300er freighters to be delivered between 2011 and 2013 , and two boeing 747-400f aircraft scheduled for delivery during 2011 .
these aircraft purchase orders will provide for the replacement of existing capacity and anticipated future growth .
pension fundings represent the anticipated required cash contributions that will be made to our qualified pension plans .
these contributions include those to the ups ibt pension plan , which was established upon ratification of the national master agreement with the teamsters , as well as the ups pension plan .
these plans are discussed further in note 5 to the consolidated financial statements .
the pension funding requirements were estimated under the provisions of the pension protection act of 2006 and the employee retirement income security act of 1974 , using discount rates , asset returns , and other assumptions appropriate for these plans .
to the extent that the funded status of these plans in future years differs from our current projections , the actual contributions made in future years could materially differ from the amounts shown in the table above .
additionally , we have not included minimum funding requirements beyond 2015 , because these projected contributions are not reasonably determinable .
we are not subject to any minimum funding requirement for cash contributions in 2011 in the ups retirement plan or ups pension plan .
the amount of any minimum funding requirement , as applicable , for these plans could change significantly in future periods , depending on many factors , including future plan asset returns and discount rates .
a sustained significant decline in the world equity markets , and the resulting impact on our pension assets and investment returns , could result in our domestic pension plans being subject to significantly higher minimum funding requirements .
such an outcome could have a material adverse impact on our financial position and cash flows in future periods .
the contractual payments due for 201cother liabilities 201d primarily include commitment payments related to our investment in certain partnerships .
the table above does not include approximately $ 284 million of liabilities for .

Question: what percentage of contractual obligations and commitments in total are debt principal and debt interest?
Answer: 72%
Calculation: add(10558, 6426), divide(#0, 23556)