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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Inventories |
|  | December 31, 2018 |  |  | December 31, 2017 |
Finished products |  | Ps. | 27,145 |  |  | Ps. | 25,864 |
Raw materials |  |  | 5,363 |  |  |  | 5,194 |
Spare parts |  |  | 1,362 |  |  |  | 2,102 |
Work in process |  |  | 225 |  |  |  | 198 |
Inventories in transit |  |  | 1,591 |  |  |  | 1,437 |
Other |  |  | — |  |  |  | 45 |
|  | Ps. | 35,686 |  |  | Ps. | 34,840 |
Summary of Changes in Inventories | For the years ended 2018, 2017 and 2016, changes in inventories are comprised as follows and included in the consolidated income statement under the cost of goods sold caption:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Changes in inventories of finished goods and work in progress |  | Ps. | 204,688 |  |  | Ps. | 188,022 |  |  | Ps. | 172,554 |
Raw materials and consumables used |  |  | 79,825 |  |  |  | 85,568 |  |  |  | 63,285 |
Total |  | Ps. | 284,513 |  |  | Ps. | 273,590 |  |  | Ps. | 235,839 |

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