Japan's key gauge of money supply rose 3.4 percent in June from a year earlier, while the balance of quasi-money -- most of it in time deposits -- extended its decline to a record eight consecutive months, the Bank of Japan said Monday.

The average daily balance of M-2 -- cash in circulation, demand deposits and quasi-money -- plus certificates of deposit came to 669.7 trillion yen, compared with a revised 670.1 trillion yen in May, the central bank said.

The balance of quasi-money fell by a record 13.9 percent to 318.3 trillion yen, following a revised 13.5 percent decline in May.