A photo illustration shows a $100 banknote placed above Chinese 100 yuan banknotes in Beijing in this May 10, 2013 file photo. [Photo/Agencies]

BEIJING - China's foreign exchange reserves shrank for a fourth straight month in October, the country's forex regulator said on Monday.

Foreign exchange reserves stood at $3.12 trillion last month, down $45.7 billion from September, according to a statement on the website of the State Administration of Foreign Exchange.