question on dual wield and parry

[Desicardo]

According to the description of parry skill it says that a character has a chance to parry one attack per round for each attack that the character has.  Is this only per attack with the primary weapon or does dual wielding give an extra parry due to the extra offhand attack that comes with improved two weapon fighting?

[Faldred]

Trig's a duel-wielding parry specialist, and he gets parries for the off-hand (I can specifically tell because I've seen him execute a riposte attack from the off-hand weapon).