"Special factors such as the earthquake last year, the nuclear problem and a temporary slowdown in the global economy as well as Japan's new year holiday came together and pushed down the trade balance," said Takeshi Minami of Norinchukin Research Institute.
"We need at least half a year of data to see what is happening on the export side," said Masamichi Adachi, economist at JPMorgan in Tokyo. "As long as China and Europe maintain some growth, Japan's overall current account surplus may not be in any real danger."