9. Cost of sales
08
| RUB million | 2011 | 2010 |
|---|---|---|
| Materials and services | (23,032) | (21,013) |
| Salaries and social contributions | (11,078) | (8,789) |
| Depreciation and amortisation | (5,486) | (4,774) |
| Natural gas | (4,951) | (4,459) |
| Sulphur and sulphuric acid | (4,838) | (2,447) |
| Fuel | (4,207) | (3,674) |
| Electricity | (3,290) | (3,152) |
| Other items | (51) | (43) |
| Change in stock of WIP and finished goods | 737 | 681 |
| (56,196) | (47,670) |
Notes to the Consolidated Financial Statements
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