we have a five year $ 1350 million revolving , multi- currency , senior unsecured credit facility maturing november 30 , 2012 ( senior credit facility ) . we had $ 128.8 million outstanding under the senior credit facility at december 31 , 2009 , and an availability of $ 1221.2 million . the senior credit facility contains provisions by which we can increase the line to $ 1750 million . we also have available uncommitted credit facilities totaling $ 84.1 million . we may use excess cash or further borrow against our senior credit facility , subject to limits set by our board of directors , to repurchase additional common stock under the $ 1.25 billion program which expires december 31 , 2010 . approximately $ 211.1 million remains authorized for future repurchases under this plan . management believes that cash flows from operations and available borrowings under the senior credit facility are sufficient to meet our expected working capital , capital expenditure and debt service needs . should investment opportunities arise , we believe that our earnings , balance sheet and cash flows will allow us to obtain additional capital , if necessary . contractual obligations we have entered into contracts with various third parties in the normal course of business which will require future payments . the following table illustrates our contractual obligations ( in millions ) : contractual obligations total 2010 thereafter .

Table:
contractual obligations | total | 2010 | 2011 and 2012 | 2013 and 2014 | 2015 and thereafter
long-term debt | $ 1127.6 | $ 2013 | $ 128.8 | $ 2013 | $ 998.8
interest payments | 1095.6 | 53.7 | 103.8 | 103.8 | 834.3
operating leases | 134.6 | 37.3 | 47.6 | 26.6 | 23.1
purchase obligations | 33.0 | 27.8 | 5.1 | 0.1 | 2013
long-term income taxes payable | 94.3 | 2013 | 56.5 | 15.3 | 22.5
other long-term liabilities | 234.2 | 2013 | 81.7 | 26.2 | 126.3
total contractual obligations | $ 2719.3 | $ 118.8 | $ 423.5 | $ 172.0 | $ 2005.0
long-term income taxes payable 94.3 2013 56.5 15.3 22.5 other long-term liabilities 234.2 2013 81.7 26.2 126.3 total contractual obligations $ 2719.3 $ 118.8 $ 423.5 $ 172.0 $ 2005.0 critical accounting estimates our financial results are affected by the selection and application of accounting policies and methods .
significant accounting policies which require management 2019s judgment are discussed below .
excess inventory and instruments 2013 we must determine as of each balance sheet date how much , if any , of our inventory may ultimately prove to be unsaleable or unsaleable at our carrying cost .
similarly , we must also determine if instruments on hand will be put to productive use or remain undeployed as a result of excess supply .
reserves are established to effectively adjust inventory and instruments to net realizable value .
to determine the appropriate level of reserves , we evaluate current stock levels in relation to historical and expected patterns of demand for all of our products and instrument systems and components .
the basis for the determination is generally the same for all inventory and instrument items and categories except for work-in-progress inventory , which is recorded at cost .
obsolete or discontinued items are generally destroyed and completely written off .
management evaluates the need for changes to valuation reserves based on market conditions , competitive offerings and other factors on a regular basis .
income taxes 2013 our income tax expense , deferred tax assets and liabilities and reserves for unrecognized tax benefits reflect management 2019s best assessment of estimated future taxes to be paid .
we are subject to income taxes in both the u.s .
and numerous foreign jurisdictions .
significant judgments and estimates are required in determining the consolidated income tax expense .
we estimate income tax expense and income tax liabilities and assets by taxable jurisdiction .
realization of deferred tax assets in each taxable jurisdiction is dependent on our ability to generate future taxable income sufficient to realize the benefits .
we evaluate deferred tax assets on an ongoing basis and provide valuation allowances if it is determined to be 201cmore likely than not 201d that the deferred tax benefit will not be realized .
federal income taxes are provided on the portion of the income of foreign subsidiaries that is expected to be remitted to the u.s .
the calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in a multitude of jurisdictions across our global operations .
we are subject to regulatory review or audit in virtually all of those jurisdictions and those reviews and audits may require extended periods of time to resolve .
we record our income tax provisions based on our knowledge of all relevant facts and circumstances , including existing tax laws , our experience with previous settlement agreements , the status of current examinations and our understanding of how the tax authorities view certain relevant industry and commercial matters .
we recognize tax liabilities in accordance with the financial accounting standards board 2019s ( fasb ) guidance on income taxes and we adjust these liabilities when our judgment changes as a result of the evaluation of new information not previously available .
due to the complexity of some of these uncertainties , the ultimate resolution may result in a payment that is materially different from our current estimate of the tax liabilities .
these differences will be reflected as increases or decreases to income tax expense in the period in which they are determined .
commitments and contingencies 2013 accruals for product liability and other claims are established with the assistance of internal and external legal counsel based on current information and historical settlement information for claims , related legal fees and for claims incurred but not reported .
we use an actuarial model to assist management in determining an appropriate level of accruals for product liability claims .
historical patterns of claim loss development z i m m e r h o l d i n g s , i n c .
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Question: what was the percent change in operating leases between 2011/12 and 2013/4?
Answer: -44%
Calculation: subtract(26.6, 47.6), divide(#0, 47.6)