Big Hitter Running Back Trivia Question

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Time for Big Hitter, Retro, and Kart to re-emerge for this expert level trivia question, in two parts that is all about big hitter running backs.
1- In 2006, of all running backs with 99 or more carries, there were 6 who gained 10 or more yards in at least 15% of their carries. Please name these 6 big hitters. I made it 99 carries and not 100 minimum to include one runner who had a dazzling percentage. Extra credit, besides naming him- what was his percentage of carries over 10 yards?

2- For the combined years 2004-2006 there were 4 big hitter runners with at least 500 carries tied for the league lead in % of runs over 10 yards. Name the four and their percentage.

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Due to the tremendous amount of interest in this quiz, I find it necessary to halt any further repsonses. Here are the answers:

1- Marion Barber 15%
    Ladell Betts 15%
    Michael Westbrook 15%
    Tiki Barber 16%
    Maurice Jones-Drew 17%
    Jerious Norwood 20%

2- Fred Taylor, Shaun Alexander, Michael Westbrook, Tiki Barber - all at 13%