Table:
|  |  | Fiscal Years Ended March 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
| Net sales (1) | $1,382,818 | $1,200,181 | $757,338 |
| Operating costs and expenses: |  |  |  |
| Cost of sales (1) | 924,276 | 860,744 | 571,944 |
| Selling, general and administrative expenses | 202,642 | 173,620 | 107,658 |
| Research and development (1) | 44,612 | 39,114 | 26,693 |
| Restructuring charges | 8,779 | 14,843 | 5,404 |
| (Gain) loss on write down and disposal of long-lived assets | 1,660 | (992) | 10,671 |
| Total operating costs and expenses | 1,181,969 | 1,087,329 | 722,370 |
| Operating income (1) | 200,849 | 112,852 | 34,968 |
| Non-operating (income) expense: |  |  |  |
| Interest income | (2,035) | (809) | (24) |
| Interest expense | 21,239 | 32,882 | 39,755 |
| Acquisition (gain) loss | — | (130,880) | — |
| Change in value of TOKIN options | — | — | (10,700) |
| Other (income) expense, net (1) | 11,214 | 24,592 | (3,871) |
| Income before income taxes and equity income (loss) from equity method investments (1) | 170,431 | 187,067 | 9,808 |
| Income tax expense (benefit) (1) | (39,460) | 9,132 | 4,294 |
| Income before equity income (loss) from equity method investments (1) | 209,891 | 177,935 | 5,514 |
| Equity income (loss) from equity method investments | (3,304) | 76,192 | 41,643 |
| Net income (1) | $206,587 | $254,127 | $47,157 |
Paragraphs:
Results of Operations
Historically, revenues and earnings may or may not be representative of future operating results due to various economic and other factors. The following table sets forth the Consolidated Statements of Operations for the periods indicated (amounts in thousands):
(1) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606.
Question:
Why were calculations for Fiscal years ended March 31, 2018 and 2017 adjusted?
Answer: due to the adoption of ASC 606.