the railroad collected approximately $ 18.8 billion and $ 16.3 billion of receivables during the years ended december 31 , 2011 and 2010 , respectively .
upri used certain of these proceeds to purchase new receivables under the facility .
the costs of the receivables securitization facility include interest , which will vary based on prevailing commercial paper rates , program fees paid to banks , commercial paper issuing costs , and fees for unused commitment availability .
the costs of the receivables securitization facility are included in interest expense and were $ 4 million and $ 6 million for 2011 and 2010 , respectively .
prior to adoption of the new accounting standard , the costs of the receivables securitization facility were included in other income and were $ 9 million for 2009 .
the investors have no recourse to the railroad 2019s other assets , except for customary warranty and indemnity claims .
creditors of the railroad do not have recourse to the assets of upri .
in august 2011 , the receivables securitization facility was renewed for an additional 364-day period at comparable terms and conditions .
contractual obligations and commercial commitments as described in the notes to the consolidated financial statements and as referenced in the tables below , we have contractual obligations and commercial commitments that may affect our financial condition .
based on our assessment of the underlying provisions and circumstances of our contractual obligations and commercial commitments , including material sources of off-balance sheet and structured finance arrangements , other than the risks that we and other similarly situated companies face with respect to the condition of the capital markets ( as described in item 1a of part ii of this report ) , there is no known trend , demand , commitment , event , or uncertainty that is reasonably likely to occur that would have a material adverse effect on our consolidated results of operations , financial condition , or liquidity .
in addition , our commercial obligations , financings , and commitments are customary transactions that are similar to those of other comparable corporations , particularly within the transportation industry .
the following tables identify material obligations and commitments as of december 31 , 2011 : payments due by december 31 , contractual obligations after millions total 2012 2013 2014 2015 2016 2016 other .

<i>Payments Due by December 31,</i>
<i>Contractual Obligations</i><i>Millions</i>
<i>Total</i>
<i>2012</i>
<i>2013</i>
<i>2014</i>
<i>2015</i>
<i>2016</i>
<i>After 2016</i>
<i>Other</i>
Debt [a]
$12,516
$538
$852
$887
$615
$652
$8,972
$-
Operating leases [b]
4,528
525
489
415
372
347
2,380
-
Capital lease obligations [c]
2,559
297
269
276
276
262
1,179
-
Purchase obligations [d]
5,137
2,598
568
560
276
245
858
32
Other post retirement benefits [e]
249
26
26
26
26
26
119
-
Income tax contingencies [f]
107
31
-
-
-
-
-
76
Total contractualobligations
$25,096
$4,015
$2,204
$2,164
$1,565
$1,532
$13,508
$108

[a] excludes capital lease obligations of $ 1874 million and unamortized discount of $ 364 million .
includes an interest component of $ 5120 million .
[b] includes leases for locomotives , freight cars , other equipment , and real estate .
[c] represents total obligations , including interest component of $ 685 million .
[d] purchase obligations include locomotive maintenance contracts ; purchase commitments for fuel purchases , locomotives , ties , ballast , and rail ; and agreements to purchase other goods and services .
for amounts where we cannot reasonably estimate the year of settlement , they are reflected in the other column .
[e] includes estimated other post retirement , medical , and life insurance payments and payments made under the unfunded pension plan for the next ten years .
no amounts are included for funded pension obligations as no contributions are currently required .
[f] future cash flows for income tax contingencies reflect the recorded liability for unrecognized tax benefits , including interest and penalties , as of december 31 , 2011 .
where we can reasonably estimate the years in which these liabilities may be settled , this is shown in the table .
for amounts where we cannot reasonably estimate the year of settlement , they are reflected in the other column. .

Question: Analyse this data from a financial earnings document. what percentage of total material obligations and commitments as of december 31 , 2011 are operating leases?
Choices:
180427.15971
0.33521
0.01654
0.01482
0.18043
Correct choice index: 4