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Costs and expenses by nature | 12 Months Ended
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Dec. 31, 2021
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Costs and expenses by nature | 20. Costs and expenses by nature The costs and expenses are presented in the statement of profit and loss by function. The reconciliation of income by nature/purpose is as follows:
| December 31, 2021 |  |  | December 31, 2020 (restated) |  |  | December 31, 2019 (restated) |
Commodity cost (natural gas) | (6,137,104 | ) |  | (3,867,044 | ) |  | (4,885,497 | )
Raw materials | (4,631,436 | ) |  | (3,289,845 | ) |  | (3,231,169 | )
Personnel expenses | (1,997,881 | ) |  | (2,533,429 | ) |  | (2,244,252 | )
Depreciation and amortization | (2,504,384 | ) |  | (2,340,854 | ) |  | (2,287,877 | )
Railroad transportation and port elevation expenses | (2,128,043 | ) |  | (1,897,975 | ) |  | (1,867,196 | )
Electricity purchased for resale | (968,503 | ) |  | (927,913 | ) |  | — |
Construction cost | (1,020,176 | ) |  | (885,630 | ) |  | (813,341 | )
Natural gas transportation cost | (1,074,441 | ) |  | (753,603 | ) |  | (703,500 | )
Other transport | (25,143 | ) |  | — |  |  | — |
Selling expenses | (23,638 | ) |  | (23,387 | ) |  | (26,168 | )
Expenses with third-party services | (751,486 | ) |  | — |  |  | — |
Other | (897,789 | ) |  | (731,869 | ) |  | (460,161 | )
| (22,160,024 | ) |  | (17,251,549 | ) |  | (16,519,161 | )
Cost of sales | (19,864,248 | ) |  | (14,999,823 | ) |  | (14,616,985 | )
Selling expenses | (723,419 | ) |  | (661,907 | ) |  | (666,114 | )
General and administrative expenses | (1,572,357 | ) |  | (1,589,819 | ) |  | (1,236,062 | )
| (22,160,024 | ) |  | (17,251,549 | ) |  | (16,519,161 | )

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- Definition The disclosure of expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_10_e&doctype=Standard -URIDate 2021-03-24 + Details
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