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Short-term borrowings (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
--- | --- | --- | ---
Short-term borrowings |  |  |
Short-term borrowings | $ 1,200,247 | ¥ 8,333,317 | ¥ 3,040,209
Short-term borrowings |  |  |
Short-term borrowings |  |  |
Weighted average interest rate | 4.91% | 4.91% | 4.40%

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