BOGOTA, Colombia, Aug 11 (Reuters) - Colombia, the world's fourth-largestproducer of palm oil, produced 276,700 tonnes in the first six months of2002, down 7.1 percent against the same period last year, a top industrygroup said on Monday.Production in the first half of 2001 reached 297,800 tonnes.The National Federation of Palm Oil Producers (Fedepalma) said exportsin the January-June period reached 58,792 tonnes, down 30.9 percent fromthe 85,064 tonnes shipped in the same period last year.Fedepalma blamed lower exports on less oil extracted and what it saidwere trade restrictions imposed by Venezuela and Mexico.Fedepalma estimates Colombia will produce 580,000 tonnes of palm oilthis year, of which 144,000 tonnes would be exported.Last year, Colombia's palm oil production rose to 547,200 tonnes, up4.4 percent against the 524,000 turned out in 2000.