TOKYO, Jan 5 (Reuters) - The Chinese yuan posted its biggest percentage gains in about a year in offshore trading on Wednesday, after Chinese authorities stepped into both its onshore and offshore yuan markets to shore up the faltering yuan for a second day.
The yuan CNH=D4 rose 1.3 percent by New York close on Wednesday to 6.8689 to the dollar, its biggest since Jan 11 last year, when it rose 1.5 percent.