The People's Bank of China (PBOC), or the central bank, auctioned 18 billion yuan (2.66 billion U.S. dollars) of one-year bills at its regular open market operations Tuesday.

Yield for the one-year bills stood unchanged at 2.0929 percent since the central bank's last one-year bill issuance on July 27, which totaled 23 billion yuan.

Some 58 billion yuan of Chinese central bank bills and repurchase agreements are due to mature this week, the second lowest level for this year and lower than the 86 billion yuan matured last week.