Japan's monetary base grew 3.6 percent in June from a year earlier for the 22nd straight month of increase as the Bank of Japan continued to ease funding conditions, data from the central bank showed Friday.

The rate of growth, however, narrowed for the first time in three months.

The average daily balance of the monetary base, composed of cash in circulation and the balance of current account deposits held by financial institutions at the BOJ, totaled ¥97.02 trillion.