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: .
[['( 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
Explanation: its the difference between those two values , in millions .