While pirate attacks in the Gulf of Aden had fallen from 20 per month in the summer of 2009, to between 4 and 5 today, the tenacity of pirates and level of their violence against mariners had changed over the years, said Rear Admiral Peter Hudson, Operations Commander of the European Union Naval Force in Somalia (EU NAVFOR) — Operation Atalanta, expressing hope that other countries would share in the asset-sapping task of combating the problem.