Table:
|  |  | Fiscal Years Ended March 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
| Net income (U.S. GAAP) (1) | $206,587 | $254,127 | $47,157 |
| Non-GAAP adjustments: |  |  |  |
| Income tax expense (benefit) | (39,460) | 9,132 | 4,294 |
| Interest expense, net | 19,204 | 32,073 | 39,731 |
| Depreciation and amortization | 52,628 | 50,661 | 38,151 |
| EBITDA (non-GAAP) (1) | 238,959 | 345,993 | 129,333 |
| Excluding the following items: |  |  |  |
| Equity (income) loss from equity method investments | 3,304 | (76,192) | (41,643) |
| Acquisition (gain) loss | — | (130,880) | — |
| Change in value of TOKIN options | — | — | (10,700) |
| (Gain) loss on write down and disposal of long-lived assets | 1,660 | (992) | 10,671 |
| ERP integration costs/IT transition costs | 8,813 | 80 | 7,045 |
| Stock-based compensation | 12,866 | 7,657 | 4,720 |
| Restructuring charges (2) | 8,779 | 14,843 | 5,404 |
| R&D grant reimbursements and grant income | (4,559) | — | — |
| Legal expenses/fines related to antitrust class actions | 11,896 | 16,636 | 2,640 |
| Net foreign exchange (gain) loss | (7,230) | 13,145 | (3,758) |
| TOKIN investment-related expenses | — | — | 1,101 |
| Plant start-up costs (2) | (927) | 929 | 427 |
| Loss on early extinguishment of debt | 15,946 | 486 | — |
| Adjusted EBITDA (non-GAAP) (1) | $289,507 | $191,705 | $105,240 |
Paragraphs:
The following table provides reconciliation from U.S. GAAP Net income to non-GAAP Adjusted EBITDA (amounts in thousands):
(1) Fiscal years ending March 31, 2018 and 2017 adjusted due to the adoption of ASC 606.
(2) $0.9 million in costs incurred during fiscal year 2018 related to the relocation of the Company's tantalum powder facility equipment from Carson City, Nevada to its existing Matamoros, Mexico plant were reclassified from “Plant start-up costs” to “Restructuring charges” during fiscal year 2019.
Question:
What was the percentage change in the net interest expense between 2018 and 2019?
Answer: (19204-32073)/32073 = -40.12