the significant changes from december 31 , 2008 to december 31 , 2009 in level 3 assets and liabilities are due to : a net decrease in trading securities of $ 10.8 billion that was driven by : 2022 net transfers of $ 6.5 billion , due mainly to the transfer of debt 2013 securities from level 3 to level 2 due to increased liquidity and pricing transparency ; and net settlements of $ 5.8 billion , due primarily to the liquidations of 2013 subprime securities of $ 4.1 billion .
the change in net trading derivatives driven by : 2022 a net loss of $ 4.9 billion relating to complex derivative contracts , 2013 such as those linked to credit , equity and commodity exposures .
these losses include both realized and unrealized losses during 2009 and are partially offset by gains recognized in instruments that have been classified in levels 1 and 2 ; and net increase in derivative assets of $ 4.3 billion , which includes cash 2013 settlements of derivative contracts in an unrealized loss position , notably those linked to subprime exposures .
the decrease in level 3 investments of $ 6.9 billion primarily 2022 resulted from : a reduction of $ 5.0 billion , due mainly to paydowns on debt 2013 securities and sales of private equity investments ; the net transfer of investment securities from level 3 to level 2 2013 of $ 1.5 billion , due to increased availability of observable pricing inputs ; and net losses recognized of $ 0.4 billion due mainly to losses on non- 2013 marketable equity securities including write-downs on private equity investments .
the decrease in securities sold under agreements to repurchase of 2022 $ 9.1 billion is driven by a $ 8.6 billion net transfers from level 3 to level 2 as effective maturity dates on structured repos have shortened .
the decrease in long-term debt of $ 1.5 billion is driven mainly by 2022 $ 1.3 billion of net terminations of structured notes .
transfers between level 1 and level 2 of the fair value hierarchy the company did not have any significant transfers of assets or liabilities between levels 1 and 2 of the fair value hierarchy during 2010 .
items measured at fair value on a nonrecurring basis certain assets and liabilities are measured at fair value on a nonrecurring basis and therefore are not included in the tables above .
these include assets measured at cost that have been written down to fair value during the periods as a result of an impairment .
in addition , these assets include loans held-for-sale that are measured at locom that were recognized at fair value below cost at the end of the period .
the fair value of loans measured on a locom basis is determined where possible using quoted secondary-market prices .
such loans are generally classified as level 2 of the fair value hierarchy given the level of activity in the market and the frequency of available quotes .
if no such quoted price exists , the fair value of a loan is determined using quoted prices for a similar asset or assets , adjusted for the specific attributes of that loan .
the following table presents all loans held-for-sale that are carried at locom as of december 31 , 2010 and 2009 : in billions of dollars aggregate cost fair value level 2 level 3 .

In billions of dollars
Aggregate cost
Fair value
Level 2
Level 3
December 31, 2010
$3.1
$2.5
$0.7
$1.8
December 31, 2009
$2.5
$1.6
$0.3
$1.3

.

Question: Analyse this data from a financial earnings document. what is the difference in billions of all loans held-for-sale that are carried at locom level 3 between 2009 and 2010?
Choices:
-5.1
0
0.7
0.5
1
Correct choice index: 3