Table:
| Quarters Ended | July 27, 2019 (1) | April 27, 2019 | January 26, 2019 | October 27, 2018 |
| --- | --- | --- | --- | --- |
| Revenue . | $13,428 | $12,958 | $12,446 | $13,072 |
| Gross margin | $8,574 | $8,173 | $7,773 | $8,146 |
| Operating income | $3,690 | $3,513 | $3,211 | $3,805 |
| Net income | $2,206 | $3,044 | $2,822 | $3,549 |
| Net income per share - basic | $0.52 | $0.70 | $0.63 | $0.78 |
| Net income per share - diluted | $0.51 | $0.69 | $0.63 | $0.77 |
| Cash dividends declared per common share . | $0.35 | $0.35 | $0.33 | $0.33 |
| Cash and cash equivalents and investments . | $33,413 | $34,643 | $40,383 | $42,593 |
Paragraphs:
Supplementary Financial Data (Unaudited)
(in millions, except per-share amounts)
(1) In the fourth quarter of fiscal 2019, we recorded an $872 million charge which was the reversal of the previously recorded benefit associated with the U.S. taxation of deemed foreign dividends recorded in fiscal 2018 as a result of a retroactive final U.S. Treasury regulation issued during the quarter.
Question:
What was the percentage change in operating income between the quarters ended January 26, 2019 and October 27, 2018?
Answer: (3211-3805)/3805 = -15.61