Yeah I'd also like to know where you have located this.
I read Raines currently [2013 season] obtains 40% of his possessions in a contest and also [as of Rnd6 2013] averages 2.5 clearances, with 4 against Adelaide. (but don't have centre attended/won clearance numbers)
Going on 2012 as he's only played a few games this season:
In Raines' 19 games, there were 571 centre square bounces at an average of 30.05 per game. It's recorded that he attended the 2nd most centre square bounces for the Brisbane Lions in 2012; let's call it at the lower end of 80% at an average of 24 per game.
Raines only won 43 clearances of any type for the season, some were around the ground. Even with the benefit of the doubt saying he won 2 per game from 24 centre square "contests", it a poultry win % of just over 8%.