Table:
|  | Fiscal 2019 |  | Fiscal 2018 |  |
| --- | --- | --- | --- | --- |
|  | Amount | Percentage of total net sales | Amount | Percentage of total net sales |
|  |  | (Dollars in thousands) |  |  |
| Research and development | $117,353 | 8.2% | $132,586 | 7.0% |
| Selling, general and administrative | 272,257 | 19.0% | 293,632 | 15.4% |
| Impairment and other charges | — | —% | 766 | —% |
| Amortization of intangible assets | 13,760 | 1.0% | 10,690 | 0.6% |
| Total operating expenses | $403,370 | 28.2% | $437,674 | 23.0% |
Paragraphs:
Operating Expenses
The following table sets forth, for the periods indicated, the amount of operating expenses and their relative percentages of total net sales by the line items reflected in our consolidated statement of operations (dollars in thousands):
Question:
In which years was operating expenses calculated?
Answer: 2019, 2018