Between 1990 and 1993, 5.4 million metric tons of hazardous waste were shipped from Australia, Canada, Germany, the United Kingdom, and the United States to thirteen Asian countries. Presumably, these figures represent only the officially-documented trade. Actual volumes are probably higher.
B. J. Ovink, Transboundary Shipments of Toxic Waste: The Basel and Bamako Conventions: Do Third World Countries Have a Choice?, 13 Penn St. Int'l L. Rev. 281 (1995).