HANOI, Feb 25 (Reuters) - Vietnam's coffee exports in the first five months of the ongoing crop year were estimated to rise 12 percent to around 526,000 tonnes, or 8.77 million bags, the government said on Wednesday.
   The General Statistic Office also estimated coffee exports this month would nearly double to 150,000 tonnes, or 2.5 million 60-kg bags, from 77,000 tonnes shipped last February.
   The coffee crop year in Vietnam, the world's second-largest producer after Brazil, runs between October and September.
   The statistics office revised down January's coffee sales to 136,000 tonnes from 140,000 tonnes estimated earlier, bringing the volume shipped in January and February to an estimated 286,000 tonnes, up 10.8 percent from the same period last year.
   Earnings from the commodity in the first two months of the calendar year would drop 9.6 percent to $440 million, the report said. Coffee remains the country's largest agriculture export in terms of value, followed by rice. (Reporting by Ho Binh Minh; Editing by Michael Urquhart)