Japan spent 5.92 trillion yen ($41 billion) on April 29 to shore up its currency against the U.S. dollar, its largest-ever single yen-buying intervention, followed by another 3.87 trillion yen two days later, government data showed Wednesday. It is the first time that official data has confirmed the dates and amounts of yen-buying, dollar-selling operations by Japanese authorities between April and June. The total amount spent during that period came to 9.79 trillion yen, a quarterly record for yen-buying. The yen’s rapid weakening had raised alarm among Japanese authorities who at the time th…