6 . performance bonds and guaranty fund contributions cme clears and guarantees the settlement of cme , cbot and nymex contracts traded in their respective markets . in its guarantor role , cme has precisely equal and offsetting claims to and from clearing firms on opposite sides of each contract , standing as an intermediary on every contract cleared . clearing firm positions are combined to create a single portfolio for each clearing firm 2019s regulated and non-regulated accounts with cme for which performance bond and guaranty fund requirements are calculated . to the extent that funds are not otherwise available to satisfy an obligation under the applicable contract , cme bears counterparty credit risk in the event that future market movements create conditions that could lead to clearing firms failing to meet their obligations to cme . cme reduces its exposure through a risk management program that includes initial and ongoing financial standards for designation as a clearing firm , performance bond requirements and mandatory guaranty fund contributions . each clearing firm is required to deposit and maintain balances in the form of cash , u.s . government securities , bank letters of credit or other approved investments to satisfy performance bond and guaranty fund requirements . all obligations and non-cash deposits are marked to market on a daily basis . in addition , the rules and regulations of cbot require certain minimum financial requirements for delivery of physical commodities , maintenance of capital requirements and deposits on pending arbitration matters . to satisfy these requirements , cbot clearing firms have deposited cash , u.s . treasury securities and letters of credit . cme marks-to-market open positions at least twice a day , and requires payment from clearing firms whose positions have lost value and makes payments to clearing firms whose positions have gained value . for select product offerings within newer markets , positions are marked-to-market once daily , with the capability to mark-to-market more frequently as market conditions warrant . under the extremely unlikely scenario of simultaneous default by every clearing firm who has open positions with unrealized losses , the maximum exposure related to cme 2019s guarantee would be one half day of changes in fair value of all open positions , before considering cme 2019s ability to access defaulting clearing firms 2019 performance bond and guaranty fund balances as well as other available resources . during 2010 , cme transferred an average of approximately $ 2.4 billion a day through its clearing system for settlement from clearing firms whose positions had lost value to clearing firms whose positions had gained value . cme reduces its guarantee exposure through initial and maintenance performance bond requirements and mandatory guaranty fund contributions . the company believes that the guarantee liability is immaterial and therefore has not recorded any liability at december 31 , 2010. .
5 . other current assets other current assets consisted of the following at december 31: .
what percentage of total other current assets is represented by
( in millions ) the receivables from brokers of 2010 is 11.2 ; the receivables from brokers of 2009 is 8.8 ; ( in millions ) the total of 2010 is $ 146.1 ; the total of 2009 is $ 165.6 ; ( in millions ) the forward contract receivable ( note 20 ) of 2010 is 11.8 ; the forward contract receivable ( note 20 ) of 2009 is 27.3 ;
( in millions ) 2010 2009
refundable income tax $ 61.0 $ 24.1
net deferred income taxes ( note 14 ) 18.3 23.8
prepaid technology license and maintenance contracts 18.0 17.0
forward contract receivable ( note 20 ) 11.8 27.3
receivables from brokers 11.2 8.8
other prepaid expenses 9.6 13.5
prepaid insurance 6.3 7.0
cboe exercise rights privilege 2014 39.8
other 9.9 4.3
total $ 146.1 $ 165.6