contractually committed revolving bank credit agreement and $ 1.0 billion of commercial paper- based financing based on eligible receivable balan- ces under a receivables securitization program , which management believes are adequate to cover expected operating cash flow variability during the current economic cycle . the credit agreements gen- erally provide for interest rates at a floating rate index plus a pre-determined margin dependent upon international paper 2019s credit rating . in november 2009 , international paper replaced its $ 1.5 billion revolving bank credit agreement that was scheduled to expire in march 2011 with a new $ 1.5 billion fully committed revolving bank credit agreement that expires in november 2012 and has a facility fee of 0.50% ( 0.50 % ) payable quarterly . the liquidity facilities also include up to $ 1.0 billion of commercial paper-based financings on eligible receivable balances ( $ 816 mil- lion at december 31 , 2009 ) under a receivables securitization program that was scheduled to expire in january 2010 with a facility fee of 0.75% ( 0.75 % ) . on jan- uary 13 , 2010 , the company amended this program to extend the maturity date from january 2010 to january 2011 . the amended agreement has a facility fee of 0.50% ( 0.50 % ) payable monthly . at december 31 , 2009 , there were no borrowings under either the bank credit agreements or receivables securitization pro- the company was in compliance with all of its debt covenants at december 31 , 2009 . the company 2019s financial covenants require the maintenance of a minimum net worth of $ 9 billion and a total- debt-to-capital ratio of less than 60% ( 60 % ) . net worth is defined as the sum of common stock , paid-in capital and retained earnings , less treasury stock plus any cumulative goodwill impairment charges . the calcu- lation also excludes accumulated other compre- hensive loss . the total-debt-to-capital ratio is defined as total debt divided by the sum of total debt plus net worth . at december 31 , 2009 , international paper 2019s net worth was $ 11.8 billion , and the total- debt-to-capital ratio was 43.3% ( 43.3 % ) . the company will continue to rely upon debt and capital markets for the majority of any necessary long-term funding not provided by operating cash flows . funding decisions will be guided by our capi- tal structure planning objectives . the primary goals of the company 2019s capital structure planning are to maximize financial flexibility and preserve liquidity while reducing interest expense . the majority of international paper 2019s debt is accessed through global public capital markets where we have a wide base of investors . maintaining an investment grade credit rating is an important element of international paper 2019s financing strategy . at december 31 , 2009 , the company held long-term credit ratings of bbb ( negative outlook ) and baa3 ( negative outlook ) and short-term credit ratings of a-3 and p-3 by s&p and moody 2019s , respectively . on february 5 , 2010 , moody 2019s investor services reduced its credit rating of senior unsecured long- term debt of the royal bank of scotland n.v . ( formerly abn amro bank n.v. ) , which had issued letters of credit that support $ 1.4 billion of install- ment notes received in connection with the compa- ny 2019s 2006 sale of forestlands . following this sale , the installment notes were contributed to third-party entities that used them as collateral for borrowings from a third-party lender . the related loan agree- ments require that if the credit rating of any bank issuing letters of credit is downgraded below a specified level , these letters of credit must be replaced within 60 days by letters of credit from another qualifying institution . the company expects that the issuer of installment notes will complete this replacement within the required 60-day period . contractual obligations for future payments under existing debt and lease commitments and purchase obligations at december 31 , 2009 , were as follows : in millions 2010 2011 2012 2013 2014 thereafter maturities of long-term debt ( a ) $ 304 $ 574 $ 199 $ 131 $ 562 $ 7263 debt obligations with right of offset ( b ) 519 28 2013 2013 2013 5108 .
considering the years 2011-2012 , what is the variation observed in the lease obligations?
( a ) total debt includes scheduled principal payments only . the 2010 debt maturities reflect the reclassification of $ 450 million of notes payable and current maturities of long-term debt to long-term debt based on international paper 2019s intent and abil- ity to renew or convert these obligations , as evidenced by the company 2019s available bank credit agreements . ( b ) represents debt obligations borrowed from non-consolidated variable interest entities for which international paper has , and intends to affect , a legal right to offset these obligations with investments held in the entities . accordingly , in its con- solidated balance sheet at december 31 , 2009 , international paper has offset approximately $ 5.7 billion of interests in the entities against this $ 5.7 billion of debt obligations held by the entities ( see note 12 of the notes to consolidated financial statements in item 8 . financial statements and supplementary data ) . .