BEIJING, May 10 (Reuters) - China, the world's top soy buyer, imported 18.15 million tonnes of soy in the first four months of the year, up 22.3 percent from a year ago, data from the General Administration of Customs of China showed on Thursday.

Imports in April came to 4.8 million tonnes, according to calculations by Reuters, almost flat on March's 4.826 million tonnes.