Coal production has grown rapidly, from 22.7 million tons in 1994 to 50.0 million tons in 2003. Over 90% of this amount was exported, making Colombia the world's sixth largest coal exporter, behind Australia, China, Indonesia, South Africa and Russia. From the mid-1980s the center of coal production was the Cerrejón mines in the Guajira department. However, the growth in output at La Loma in neighboring Cesar Department made this area the leader in Colombian coal production since 2004. Production in other departments, including Boyacá, Cundinamarca and Norte de Santander, forms about 13% of the total. The coal industry is largely controlled by international mining companies, including a consortium of BHP Billiton, Anglo American and Glencore International at Cerrejón, and Conundrum Company at La Loma, which is undergoing a lawsuit in the U.S. District Court in Alabama for union assassinations and alleged paramilitary links.