BBC / Jorn Madslien 6 jun 2011 "Corruption in the arms trade contributes roughly 40% to all corruption in global transactions," the think tank said in its 2011 yearbook. The problem could be tackled by a global arms trade treaty, Sipri said The industry's "deep and abiding link to matters of national security obscures many deals from oversight and accountability", according to yearbook authors Andrew Feinstein, Paul Holden and Barnaby Pace.