{"pre_text": ["annual report 2013 duke realty corporation 37 in addition to the capitalization of overhead costs discussed above , we also capitalized $ 16.8 million , $ 9.4 million and $ 4.3 million of interest costs in the years ended december 31 , 2013 , 2012 and 2011 , respectively .", "the following table summarizes our second generation capital expenditures by reportable operating segment ( in thousands ) : ."], "post_text": ["both our first and second generation expenditures vary significantly between leases on a per square foot basis , dependent upon several factors including the product type , the nature of a tenant's operations , the specific physical characteristics of each individual property as well as the market in which the property is located .", "second generation expenditures related to the 79 suburban office buildings that were sold in the blackstone office disposition totaled $ 26.2 million in 2011 .", "dividends and distributions we are required to meet the distribution requirements of the internal revenue code of 1986 , as amended ( the \"code\" ) , in order to maintain our reit status .", "we paid dividends of $ 0.68 per common share for each of the years ended december 31 , 2013 , 2012 and 2011 .", "we expect to continue to distribute at least an amount equal to our taxable earnings , to meet the requirements to maintain our reit status , and additional amounts as determined by our board of directors .", "distributions are declared at the discretion of our board of directors and are subject to actual cash available for distribution , our financial condition , capital requirements and such other factors as our board of directors deems relevant .", "at december 31 , 2013 we had three series of preferred stock outstanding .", "the annual dividend rates on our preferred shares range between 6.5% ( 6.5 % ) and 6.625% ( 6.625 % ) and are paid quarterly in arrears .", "in february 2013 , we redeemed all of our outstanding series o shares for a total payment of $ 178.0 million , thus reducing our future quarterly dividend commitments by $ 3.7 million .", "in march 2012 , we redeemed all of our 6.950% ( 6.950 % ) series m cumulative redeemable preferred shares ( \"series m shares\" ) for a total payment of $ 168.3 million , thus reducing our future quarterly dividend commitments by $ 2.9 million .", "in july 2011 , we redeemed all of our 7.25% ( 7.25 % ) series n cumulative redeemable preferred shares ( \"series n shares\" ) for a total payment of $ 108.6 million , thus reducing our future quarterly dividend commitments by $ 2.0 million .", "debt maturities debt outstanding at december 31 , 2013 had a face value totaling $ 4.3 billion with a weighted average interest rate of 5.49% ( 5.49 % ) and with maturity dates ranging between 2014 and 2028 .", "of this total amount , we had $ 3.1 billion of unsecured debt , $ 1.1 billion of secured debt and $ 88.0 million outstanding on the drlp unsecured line of credit at december 31 , 2013 .", "we made scheduled and unscheduled principal payments of $ 1.0 billion on outstanding debt during the year ended december 31 , 2013. ."], "table": [["", "2013", "2012", "2011"], ["industrial", "$ 41971", "$ 33095", "$ 34872"], ["office", "46600", "30092", "63933"], ["medical office", "3106", "641", "410"], ["non-reportable rental operations segments", "121", "56", "49"], ["total", "$ 91798", "$ 63884", "$ 99264"]], "table_ori": [["", "2013", "2012", "2011"], ["Industrial", "$41,971", "$33,095", "$34,872"], ["Office", "46,600", "30,092", "63,933"], ["Medical Office", "3,106", "641", "410"], ["Non-reportable Rental Operations segments", "121", "56", "49"], ["Total", "$91,798", "$63,884", "$99,264"]]}

Question: what was the percent of the debt maturities outstanding at december 31 , 2013 that was unsecured debt
Evidence:
text_13: debt maturities debt outstanding at december 31 , 2013 had a face value totaling $ 4.3 billion with a weighted average interest rate of 5.49% ( 5.49 % ) and with maturity dates ranging between 2014 and 2028 .
text_14: of this total amount , we had $ 3.1 billion of unsecured debt , $ 1.1 billion of secured debt and $ 88.0 million outstanding on the drlp unsecured line of credit at december 31 , 2013 .
Program: divide(3.1, 4.3)
Answer:
str_answer: 72.1%
exe_answer: 0.72093