BEIJING--China's foreign-exchange reserves dropped in September after five straight months of increases, official data showed Wednesday.

The country's hoard of foreign exchange decreased by $22.1 billion to $3.143 trillion at the end of September, according to data released by the People's Bank of China.

Economists polled by The Wall Street Journal had expected a $2.1 billion fall in reserves in September. In August, China's foreign-exchange reserves increased by $10.2 billion.

The U.S. dollar dropped 0.8% against the Chinese yuan last month. Meanwhile, the U.S. dollar index rose 1.8% in September, compared with a 1.4% fall in August, according to information provider Wind.

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(END) Dow Jones Newswires

10-07-20 0305ET