South Korea’s foreign reserves rose for the fifth consecutive month in October, supported by higher investment income.

The Bank of Korea(BOK) announced Wednesday that the nation’s foreign currency reserves stood at 428-point-82 billion dollars at the end of October, up six-point-eight billion dollars from a month earlier.

The BOK said higher investment returns and the issuance of new foreign-currency-denominated FX stabilization bonds largely drove the increase.

The value of securities, including government and corporate bonds, fell by 460 million dollars, while foreign currency deposits increased by seven-point-four billion dollars.

As of the end of September, South Korea’s foreign exchange reserves were the ninth-largest in the world.