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Inventories | 12 Months Ended
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Dec. 31, 2018
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Inventories |
15. | INVENTORIES
|  | December 31, 2017 |  |  | December 31, 2018 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Finished goods |  | $ | 9,923.3 |  |  | $ | 11,329.8 |
Work in process |  |  | 53,362.2 |  |  |  | 72,071.9 |
Raw materials |  |  | 7,143.8 |  |  |  | 15,233.9 |
Supplies and spare parts |  |  | 3,451.4 |  |  |  | 4,595.4 |
|  | $ | 73,880.7 |  |  | $ | 103,231.0 |
Write-down of inventories to net realizable value in the amount NT$1,542.8 million (excluding earthquake losses) and NT$1,259.5 million (excluding computer virus outbreak losses), respectively, were included in the cost of revenue for the years ended December 31, 2016 and 2018. Reversal of write-down of inventories resulting from the increase in net realizable value in the amount of NT$840.9 million was included in the cost of revenue for the year ended December 31, 2017. Please refer to earthquake losses and computer virus outbreak losses in Note 41.

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