The nation's monetary base surged 36.0 percent in June from a year earlier to ¥163.54 trillion, marking a record high for the fourth straight month, the Bank of Japan said Tuesday as it continued injecting money into the financial system under its ultra-easy monetary policy.

The average daily balance of liquidity provided by the BOJ — consisting of cash in circulation and the balance of current account deposits held by commercial financial institutions at the bank — grew for the 14th straight month.

The country's monetary base at the end of June stood at ¥173.13 trillion, the most ever, the BOJ said.