anticipated or possible short-term cash needs , prevailing interest rates , our investment policy and alternative investment choices . a majority of our cash and cash equivalents balance is invested in money market mutual funds that invest only in u.s . treasury securities or u.s . government agency securities . our exposure to risk is minimal given the nature of the investments . our practice is to have our pension plan 100% ( 100 % ) funded at each year end on a projected benefit obligation basis , while also satisfying any minimum required contribution and obtaining the maximum tax deduction . based on our actuarial projections , we estimate that a $ 14.1 million contribution in 2011 will allow us to meet our funding goal . however , the amount of the actual contribution is contingent on the actual rate of return on our plan assets during 2011 and the december 31 , 2011 discount rate . net current deferred tax assets of $ 18.3 million and $ 23.8 million are included in other current assets at december 31 , 2010 and 2009 , respectively . total net current deferred tax assets include unrealized losses , stock- based compensation and accrued expenses . net long-term deferred tax liabilities were $ 7.8 billion and $ 7.6 billion at december 31 , 2010 and 2009 , respectively . net deferred tax liabilities are principally the result of purchase accounting for intangible assets in our various mergers including cbot holdings and nymex holdings . we have a long-term deferred tax asset of $ 145.7 million included within our domestic long-term deferred tax liability . this deferred tax asset is for an unrealized capital loss incurred in brazil related to our investment in bm&fbovespa . as of december 31 , 2010 , we do not believe that we currently meet the more-likely-than-not threshold that would allow us to fully realize the value of the unrealized capital loss . as a result , a partial valuation allowance of $ 64.4 million has been provided for the amount of the unrealized capital loss that exceeds potential capital gains that could be used to offset the capital loss in future periods . we also have a long-term deferred tax asset related to brazilian taxes of $ 125.3 million for an unrealized capital loss incurred in brazil related to our investment in bm&fbovespa . a full valuation allowance of $ 125.3 million has been provided because we do not believe that we currently meet the more-likely-than-not threshold that would allow us to realize the value of the unrealized capital loss in brazil in the future . valuation allowances of $ 49.4 million have also been provided for additional unrealized capital losses on various other investments . net long-term deferred tax assets also include a $ 19.3 million deferred tax asset for foreign net operating losses related to swapstream . our assessment at december 31 , 2010 was that we did not currently meet the more-likely- than-not threshold that would allow us to realize the value of acquired and accumulated foreign net operating losses in the future . as a result , the $ 19.3 million deferred tax assets arising from these net operating losses have been fully reserved . each clearing firm is required to deposit and maintain specified performance bond collateral . performance bond requirements are determined by parameters established by the risk management department of the clearing house and may fluctuate over time . we accept a variety of collateral to satisfy performance bond requirements . cash performance bonds and guaranty fund contributions are included in our consolidated balance sheets . clearing firm deposits , other than those retained in the form of cash , are not included in our consolidated balance sheets . the balances in cash performance bonds and guaranty fund contributions may fluctuate significantly over time . cash performance bonds and guaranty fund contributions consisted of the following at december 31: .

Table: ( in millions ) 2010 2009 cash performance bonds $ 3717.0 $ 5834.6 cash guaranty fund contributions 231.8 102.6 cross-margin arrangements 79.7 10.6 performance collateral for delivery 10.0 34.1 total $ 4038.5 $ 5981.9

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Question: what is the decrease of the cash perfomance bonds in the years of 2009 and 2010 in millions?
Answer: -2117.6
Calculation: subtract(3717.0, 5834.6)
Explanation: its the difference between those two values , in millions .