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Inventories | 12 Months Ended
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Dec. 31, 2021
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Inventories |
13. | INVENTORIES
|  | December 31, 2020 |  |  | December 31, 2021 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Finished goods |  | $ | 21,705.6 |  |  | $ | 32,562.8 |
Work in process |  |  | 91,672.9 |  |  |  | 137,700.4 |
Raw materials |  |  | 14,716.0 |  |  |  | 11,111.1 |
Supplies and spare parts |  |  | 9,258.9 |  |  |  | 11,728.0 |
|  | $ | 137,353.4 |  |  | $ | 193,102.3 |
Write-down of inventories to net realizable value and reversal of write-down of inventories resulting from the increase in net realizable value were included in the cost of revenue during reporting period. The amounts are illustrated below:
|  | Years Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Inventory losses (reversal of write-down of inventories) |  | $ | (1,983.0 | ) |  | $ | 3,664.5 |  |  | $ | 533.0 |
The aforementioned inventory losses (reversal of write-down of inventories) for the years ended December 31, 2019 excluded wafer contamination losses. Please refer to related losses in Note 37.

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