Table:
|  |  | Years Ended December 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
| Semiconductor Equipment | $403,018 | $533,770 | $554,063 |
| Industrial & Medical | 245,992 | 185,122 | 116,949 |
| Data Center Computing | 91,438 | — | — |
| Telecom & Networking | 48,500 | — | — |
| Total | $788,948 | $718,892 | $671,012 |
Paragraphs:
ADVANCED ENERGY INDUSTRIES, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (continued) (in thousands, except per share amounts)
Disaggregation of Revenue
The following table presents our sales by product line, which includes certain reclassifications to prior comparative periods to conform to our current year presentation:
Question:
What was the change in sales of Semiconductor Equipment between 2017 and 2018?
Answer: $533770-$554063 = -20293