Who are the NFC's most efficient pass rushers?

• It will be interesting to see how these percentages change for players such as Orakpo, Carter, and Peppers as they could all be playing in a 3-4 defense next year.  Orakpo did play SLB in the base defense for Washington in 2009 but he did not rush the QB that often from that position.  He shifted to DE in obvious passing situations which likely kept him fresher than if he rushed the QB from DE on all downs.
• I don't understand why there was so much negativity towards Osi Umenyiora from Giants' fans.  Yes he was horrible against the run but he still led his team in sacks despite rushing the QB fewer times than Tuck and Kiwanuka.  He had just 4 fewer sacks that DeMarcus Ware even though he rushed 230 fewer times and he was likely not playing at 100% as he was only one year removed from reconstructive knee surgery.
• The player with the lowest sack % was Jamaal Anderson of the Falcons who had just 1/2 sack in 285 pass-rushes (0.1%).  Anderson, who was drafted 8th overall in 2007, had just 2.5 sacks in his first three years.  I have a feeling he's not going to reach that $5 million incentive clause that he would make if he reaches 40 total sacks between 2007 and 2010.
• The highest sack % for a non-DE/non-OLB was Takeo Spikes of the 49ers.  He had 4 sacks on just 45 pass-rush attempts (8.89%).  His ILB partner, Patrick Willis, also had 4 sacks but he did it in 117 pass-rush attempts (3.42%).