South Korea's bond issuance rose 13.7 percent in March as the nation's central bank increased its debt sales, the nation's bourse operator said Monday.

The total bonds issued by the nation's state enterprises, private companies and other agencies last month amounted to 56.98 trillion won (42.9 billion U.S. dollars), according to the Korea Exchange.

The rise in bonds is attributed to the nation's central bank, the Bank of Korea (BOK), selling more monetary stabilization bonds, according to the bourse.

The nation's outstanding bonds stood at 924.1 trillion won (695.8 billion U.S. dollars) as of the end of March, up 14.13 trillion won (10.8 billion U.S. dollars) from a month earlier, the bourse added.