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Inventories | 12 Months Ended
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Dec. 31, 2019
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Inventories |
13. | INVENTORIES
|  | December 31, 2018 |  |  | December 31, 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Finished good s |  | $ | 11,329.8 |  |  | $ | 8,924.5 |
Work in process |  |  | 72,071.9 |  |  |  | 51,969.1 |
Raw materials |  |  | 15,233.9 |  |  |  | 16,552.3 |
Supplies and spare parts |  |  | 4,595.4 |  |  |  | 5,535.3 |
|  | $ | 103,231.0 |  |  | $ | 82,981.2 |
Reversal of write-down of inventories resulting from the increase in net realizable value and write-down of inventories to net realizable value were included in the cost of revenue, as illustrated below:
|  | Years Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Inventory losses (reversal of write-down of inventories ) |  | $ | (840.9 | ) |  | $ | 1,259.5 |  |  | $ | (1,983.0 | )
The aforementioned inventory losses (reversal of write-down of inventories) exclude computer virus outbreak losses and wafer contamination losses. Please refer to related losses in Note 38.

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