http://wowwiki.wikia.com/wiki/Hunger_for_Blood
Patch 3.1.0 (14-Apr-2009): No longer stacks. Damage bonus changed to 15% for a single application. Requires a bleed effect active on the rogue's target. No longer removes bleeds from the rogue. Now costs 15 energy and lasts for 60 seconds.
shouldnt it be 15%?

