table of contents in march 2008 , the fasb issued sfas no .161 , disclosures about derivative instruments and hedging activities 2014an amendment of fasb statement no .133 , which requires companies to provide additional disclosures about its objectives and strategies for using derivative instruments , how the derivative instruments and related hedged items are accounted for under sfas no .133 , accounting for derivative instruments and hedging activities , and related interpretations , and how the derivative instruments and related hedged items affect the company 2019s financial statements .sfas no .161 also requires companies to disclose information about credit risk-related contingent features in their hedged positions .sfas no .161 is effective for fiscal years and interim periods beginning after november 15 , 2008 and is required to be adopted by the company beginning in the second quarter of fiscal 2009 .although the company will continue to evaluate the application of sfas no .161 , management does not currently believe adoption will have a material impact on the company 2019s financial condition or operating results .liquidity and capital resources the following table presents selected financial information and statistics as of and for the three fiscal years ended september 27 , 2008 ( in millions ) : as of september 27 , 2008 , the company had $ 24.5 billion in cash , cash equivalents , and short-term investments , an increase of $ 9.1 billion from september 29 , 2007 .the principal components of this net increase were cash generated by operating activities of $ 9.6 billion , proceeds from the issuance of common stock under stock plans of $ 483 million and excess tax benefits from stock-based compensation of $ 757 million .these increases were partially offset by payments for acquisitions of property , plant , and equipment of $ 1.1 billion , payments made in connection with business acquisitions , net of cash acquired , of $ 220 million and payments for acquisitions of intangible assets of $ 108 million .the company 2019s cash generated by operating activities significantly exceeded its net income due primarily to the large increase in deferred revenue , net of deferred costs , associated with subscription accounting for iphone .the company 2019s short-term investment portfolio is invested primarily in highly rated securities with a minimum rating of single-a .as of september 27 , 2008 and september 29 , 2007 , $ 11.3 billion and $ 6.5 billion , respectively , of the company 2019s cash , cash equivalents , and short- term investments were held by foreign subsidiaries and are generally based in u.s .dollar-denominated holdings .the company had $ 117 million in net unrealized losses on its investment portfolio , primarily related to investments with stated maturities ranging from one to five years , as of september 27 , 2008 , and net unrealized losses of approximately $ 11 million on its investment portfolio , primarily related to investments with stated maturities from one to five years , as of september 29 , 2007 .the company has the intent and ability to hold such investments for a sufficient period of time to allow for recovery of the principal amounts invested .accordingly , none of these declines in fair value were recognized in the company 2019s statement of operations .the company believes its existing balances of cash , cash equivalents , and short-term investments will be sufficient to satisfy its working capital needs , capital expenditures , outstanding commitments , and other liquidity requirements associated with its existing operations over the next 12 months .capital assets the company 2019s cash payments for capital asset purchases were $ 1.1 billion during 2008 , consisting of $ 389 million for retail store facilities and $ 702 million for real estate acquisitions and corporate infrastructure including information systems enhancements .the company anticipates utilizing approximately $ 1.5 billion for capital asset purchases during 2009 , including approximately $ 400 million for retail facilities and approximately $ 1.1 billion for corporate facilities and infrastructure. .
[['', '2008', '2007', '2006'], ['cash cash equivalents and short-term investments', '$ 24490', '$ 15386', '$ 10110'], ['accounts receivable net', '$ 2422', '$ 1637', '$ 1252'], ['inventory', '$ 509', '$ 346', '$ 270'], ['working capital', '$ 20598', '$ 12676', '$ 8066'], ['annual operating cash flow', '$ 9596', '$ 5470', '$ 2220']]
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Question: between september 27 , 2008 and september 29 , 2007 how much in billions did the company 2019s cash , cash equivalents , and short- term investments held by foreign subsidiaries increase?
Answer: 4.8