Year ended December 31, | ||||||||
2017 | 2016 | 2015 | ||||||
Inventories at the beginning of the year | 1,647,869 | 1,579,120 | 2,134,034 | |||||
Acquisition of business (Note 3) | 400,047 | — | — | |||||
Translation differences | (97,148 | ) | (82,515 | ) | (204,512 | ) | ||
Plus: Charges for the year | ||||||||
Raw materials and consumables used and other movements | 6,337,283 | 4,060,783 | 4,548,219 | |||||
Services and fees | 110,949 | 77,698 | 86,874 | |||||
Labor cost | 673,821 | 560,513 | 599,989 | |||||
Depreciation of property, plant and equipment | 348,415 | 314,649 | 335,302 | |||||
Amortization of intangible assets | 35,275 | 40,225 | 48,442 | |||||
Maintenance expenses | 480,496 | 457,734 | 507,895 | |||||
Office expenses | 7,350 | 7,112 | 6,683 | |||||
Insurance | 7,968 | 8,432 | 9,435 | |||||
(Recovery) Charge of obsolescence allowance | (4,028 | ) | 4,600 | (4,816 | ) | |||
Recovery from sales of scrap and by-products | (25,973 | ) | (21,010 | ) | (31,096 | ) | ||
Others | 31,631 | 24,918 | 19,943 | |||||
Less: Inventories at the end of the year | (2,550,930 | ) | (1,647,869 | ) | (1,579,120 | ) | ||
Cost of Sales | 7,403,025 | 5,384,390 | 6,477,272 | |||||