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Administrative expenses (Details) - PEN (S/) S/ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Administrative Expenses |  |  |
Personnel expenses, note 21(b) | S/ 94,437 | S/ 100,059 | S/ 94,129
Third-party services | 65,435 | 63,085 | 56,669
Depreciation and amortization | 14,949 | 12,761 | 10,671
Board of Directors compensation | 6,555 | 6,149 | 7,105
Donations | 7,305 | 5,832 | 6,060
Taxes | 3,756 | 2,861 | 2,214
Consumption of supplies | 2,743 | 2,053 | 2,419
Environmental expenditures, note 27 | 437 | 576 | 456
Total administrative expenses | S/ 195,617 | S/ 193,376 | S/ 179,723

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