pre_text: Consolidated Statements of Financial Position Data: * Adjusted IFRS balances to reflect the impact of the full retrospective adoption of IFRS 15. See Note 2 of the notes to our consolidated financial statements for further details.
table: As of June 30,
table: 2019 2018 2017 2016 2015
table: (U.S. $ in thousands)
table: *As Adjusted *As Adjusted
table: Cash and cash equivalents $1,268,441 $1,410,339 $244,420 $259,709 $187,094
table: Short-term investments 445,046 323,134 305,499 483,405 30,251
table: Derivative assets 215,233 99,995 3,252 — —
table: Working capital (287,597) 1,377,145 296,984 542,038 50,477
table: Total assets 2,977,258 2,421,828 1,282,117 990,973 397,161
table: Deferred revenue 468,820 342,871 245,195 181,068 136,565
table: Derivative liabilities 855,079 207,970 — — —
table: Exchangeable senior notes, net 853,576 819,637 — — —
table: Total liabilities 2,411,791 1,514,508 379,424 259,310 207,107
table: Share capital 24,199 23,531 22,726 21,620 18,461
table: Total equity 565,467 907,320 902,693 731,663 190,054
question: Analyse this data from a financial earnings document. What is the average  Cash and cash equivalents for 2015-2019?