Islamic State (ISIS) group revenues have dropped by around 30 percent since last year, forcing the group to introduce a range of new taxes including a levy on repairing satellite dishes, a research group says.
"In mid-2015, the Islamic State's overall monthly revenue was around $80 million," Ludovico Carlino, senior analyst at IHS, which issues regular reports on ISIS-controlled territory, was quoted by AFP as having said.
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