Tokyo, June 25 (BridgeNews) - Japan's May corporate service price index averaged 95.9 (1995=100), down 1.0% on the year and 0.5% on the month, the Bank of Japan said. Year-on-year falls in the CSPI have been accelerating recently. The CSPI declined 0.3% in January, 0.7% in February, 0.8% in March and 0.7% in April.