12. Selling expenses

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RUB Million
RUB Million
Russian Railways infrastructure tariff and operators’ fees (3,825) (3,488)
Port and stevedoring expenses (2,309) (1,571)
Materials and services (1,184) (1,027)
Salaries and social contributions (341) (340)
Depreciation and amortisation (61) (66)
(7,720) (6,492)

During the current period the Group made a decision to re-classify some part of expenses on depreciation, amortisation, salaries and social contributions, previously included in selling expenses, to administrative expenses. As a result selling expenses decreased by RUB 96 million from RUB 6,588 million to RUB 6,492 million for the year ended 31 December 2011.