39 annual report 2010 duke realty corporation | | related party transactions we provide property and asset management , leasing , construction and other tenant related services to unconsolidated companies in which we have equity interests . for the years ended december 31 , 2010 , 2009 and 2008 , respectively , we earned management fees of $ 7.6 million , $ 8.4 million and $ 7.8 million , leasing fees of $ 2.7 million , $ 4.2 million and $ 2.8 million and construction and development fees of $ 10.3 million , $ 10.2 million and $ 12.7 million from these companies . we recorded these fees based on contractual terms that approximate market rates for these types of services , and we have eliminated our ownership percentages of these fees in the consolidated financial statements . commitments and contingencies we have guaranteed the repayment of $ 95.4 million of economic development bonds issued by various municipalities in connection with certain commercial developments . we will be required to make payments under our guarantees to the extent that incremental taxes from specified developments are not sufficient to pay the bond debt service . management does not believe that it is probable that we will be required to make any significant payments in satisfaction of these guarantees . we also have guaranteed the repayment of secured and unsecured loans of six of our unconsolidated subsidiaries . at december 31 , 2010 , the maximum guarantee exposure for these loans was approximately $ 245.4 million . with the exception of the guarantee of the debt of 3630 peachtree joint venture , for which we recorded a contingent liability in 2009 of $ 36.3 million , management believes it probable that we will not be required to satisfy these guarantees . we lease certain land positions with terms extending to december 2080 , with a total obligation of $ 103.6 million . no payments on these ground leases are material in any individual year . we are subject to various legal proceedings and claims that arise in the ordinary course of business . in the opinion of management , the amount of any ultimate liability with respect to these actions will not materially affect our consolidated financial statements or results of operations . contractual obligations at december 31 , 2010 , we were subject to certain contractual payment obligations as described in the table below: .

Table:
contractual obligations | payments due by period ( in thousands ) total | payments due by period ( in thousands ) 2011 | payments due by period ( in thousands ) 2012 | payments due by period ( in thousands ) 2013 | payments due by period ( in thousands ) 2014 | payments due by period ( in thousands ) 2015 | payments due by period ( in thousands ) thereafter
long-term debt ( 1 ) | $ 5413606 | $ 629781 | $ 548966 | $ 725060 | $ 498912 | $ 473417 | $ 2537470
lines of credit ( 2 ) | 214225 | 28046 | 9604 | 176575 | - | - | -
share of debt of unconsolidated joint ventures ( 3 ) | 447573 | 87602 | 27169 | 93663 | 34854 | 65847 | 138438
ground leases | 103563 | 2199 | 2198 | 2169 | 2192 | 2202 | 92603
operating leases | 2704 | 840 | 419 | 395 | 380 | 370 | 300
development and construction backlog costs ( 4 ) | 521041 | 476314 | 44727 | - | - | - | -
other | 1967 | 1015 | 398 | 229 | 90 | 54 | 181
total contractual obligations | $ 6704679 | $ 1225797 | $ 633481 | $ 998091 | $ 536428 | $ 541890 | $ 2768992
( 1 ) our long-term debt consists of both secured and unsecured debt and includes both principal and interest .
interest expense for variable rate debt was calculated using the interest rates as of december 31 , 2010 .
( 2 ) our unsecured lines of credit consist of an operating line of credit that matures february 2013 and the line of credit of a consolidated subsidiary that matures july 2011 .
interest expense for our unsecured lines of credit was calculated using the most recent stated interest rates that were in effect .
( 3 ) our share of unconsolidated joint venture debt includes both principal and interest .
interest expense for variable rate debt was calculated using the interest rate at december 31 , 2010 .
( 4 ) represents estimated remaining costs on the completion of owned development projects and third-party construction projects. .

Question: what is the total long-term debt as a percentage of total contractual obligations?
Answer: 80.7%
Calculation: divide(5413606, 6704679), multiply(#0, const_100)