COLOMBIA COFFEE REVENUE SHARPLY DOWN IN JAN/FEB Colombia's coffee export revenue dropped 97 mln dlrs to 233.6 mln dlrs for the first two months of the year against 330.9 mln dlrs in the similar period of 1986, central bank preliminary figures show. Experts attributed the fall to lower world market prices following the failure to re-introduce international coffee export quotas, but they said Colombia could compensate the drop with higher exports in calendar 1987. Coffee export revenue for 1986 was 2.33 billion dlrs, according to the bank. Jorge Cardenas, manager of the National Coffee Growers' Federation, last week estimated the recent drop of 30 cents a lb in coffee prices would mean a net loss revenue of 457 mln dlrs for Colombia. But he stressed that Colombia, with stockpiles of 10 mln (60-kg) bags, had the capacity to export more and would use a recently-introduced more flexible marketing policy to do so.