The International Maritime Bureau (IMB) regularly produces reports on global piracy. In recent years, the focus has been on Somali piracy because most of the attacks have occurred in the Gulf of Aden and Western Indian Ocean. The IMB's most recent report detects a decline in Somali pirate attacks and a growing number off the coast of West Africa. You can request IMB piracy reports free of charge by clicking here.
The International Maritime Organization (IMO) produced an excellent report in 2011 titled Piracy and Armed Robbery against Ships in Waters off the Coast of Somalia: Best Management Practices for Protection against Somalia Based Piracy. Click here to read the entire report.