pre_text: Item 6. Selected Financial Data The following selected consolidated financial data set forth below was derived from our historical audited consolidated financial statements and should be read in conjunction with Item 7 – Management’s Discussion and Analysis of Financial Condition and Results of Operations and Item 8 – Financial Statements and Supplementary Data, and other financial data included elsewhere in this Annual Report on Form 10-K. Our historical results of operations are not indicative of our future results of operations. (2) Fiscal 2018 and 2017 have been adjusted for our retrospective adoption of the new accounting standard Revenue from Contracts with Customers (ASC 606). Refer to Note 7 – Revenue of the Notes to Consolidated Financial Statements for details.
table: April 26, 2019 April 27, 2018 (2) April 28, 2017 (2) April 29, 2016 April 24, 2015
table: (In millions)
table: Cash, cash equivalents and short-term investments $ 3,899 $ 5,391 $ 4,921 $ 5,303 $ 5,326
table: Working capital $ 1,743 $ 3,421 $ 2,178 $ 2,786 $ 4,064
table: Total assets $ 8,741 $ 9,991 $ 9,562 $ 10,037 $ 9,401
table: Total debt $ 1,793 $ 1,926 $ 1,993 $ 2,339 $ 1,487
table: Total deferred revenue and financed unearned services revenue $ 3,668 $ 3,363 $ 3,213 $ 3,385 $ 3,197
table: Total stockholders' equity $ 1,090 $ 2,276 $ 2,949 $ 2,881 $ 3,414
question: Analyse this data from a financial earnings document. What was the change in working capital between 2015 and 2016?