I have previously cited the IMB's statistics and their latest figures for 2012, a week old are:
Incidents Reported for Somalia:
Total Incidents: 70
Total Hijackings:13
Total Hostages: 212

Current vessels held by Somali pirates:
Vessels: 11 Hostages: 188.
Link:http://www.icc-ccs.org/piracy-report...cynewsafigures

This was the situation last year:
According to 18 August 2011 data presented by ICC International Maritime Bureau (IMB) Piracy Reporting Centre, piracy in Somalia this year has led to 178 incidents, 22 hijackings, 362 hostages, and 7 deaths. IMB further found that pirates are currently holding 19 vessels and 377 crew members.
There are some differences from the USN figures, although there is a decline in attacks and thankfully a drop in the hostages held - whom officialdom appear to view with Admiral Nelson's blind eye.