TOKYO, June 27 (Xinhua) -- Japan's consumer prices in May soared 3.4 percent from a year earlier, the biggest increase in more than three decades, Japanese Internal Affairs Ministry said Friday.
The core consumer price index, excluding fresh food, stood at 103.4 against the 2010 base of 100, up for the 12th straight month, according to the ministry.
The rise of energy costs following the April consumption tax hike partly contributed the upturn, which jumped 10.1 percent from the previous year.
In detail, electricity prices were up 11.4 percent while gas and gasoline prices separately rose 8.9 percent and 9.6 percent.
The core CPI for Tokyo's 23 wards in June, which indicates nationwide price moves down the road, climbed 2.8 percent to 102.0 for the 14th straight monthly increase, affected by an increase in food prices and hotel and electricity charges.
Separate data released the same day showed that the country's average monthly household spending dropped an inflation-adjusted 8. 0 percent in May to 271,411 yen (about 2671.09 U.S. dollars), down for the second straight month.