How many carries for Harvin?

One of the benefits of having a versatile offensive weapon like Percy Harvin on a football team is the variety of ways that the team in question can get the ball into the player's hands -- defenses have to prepare for just about anything, and this can work both by actually getting the ball to the player and in using him as a decoy. The Seattle Seahawks traded away a first-round pick (and invested a six-year, $67 million contract) in order to have this ability. We know that Harvin will have a significant role as a pass-catcher and returner, but how many carries will he have?