Table:
|  | July 27, 2019 | July 28, 2018 |
| --- | --- | --- |
| Available-for-sale debt investments | $21,660 | $37,009 |
| Marketable equity securities | 3 | 605 |
| Total investments | 21,663 | 37,614 |
| Non-marketable equity securities included in other assets (1) | 1,113 | 978 |
| Equity method investments included in other assets | 87 | 118 |
| Total | $22,863 | $38,710 |
Paragraphs:
9. Available-for-Sale Debt Investments and Equity Investments
The following table summarizes our available-for-sale debt investments and equity investments (in millions):
(1) We held equity interests in certain private equity funds of $0.6 billion as of July 27, 2019 which are accounted for under the NAV practical expedient following the adoption of ASU 2016-01, Financial Instruments, starting in the first quarter of fiscal 2019.
Question:
What was the percentage change in the total available-for-sale debt investments and equity investments between 2018 and 2019?
Answer: (22863-38710)/38710 = -40.94