Google Paid Clicks Up 3%

It seems that growth may have slowed at Google but these numbers seem very hard to interpret and seem to be contradicted by other sources.

Web search marketing firm SearchIgnite, which places $300 million in ads on
behalf of large- and mid-sized advertisers and their ad agencies, says its own
data shows Google's year-to-year paid click rate growing 29.0 percent in
February.

So is the February paid click-rate up 3% or 29% in February? Can Comscore be trusted to give decent measures or do we trust an ad placement firm instead? I would be willing to side more with the ad placement firm because they are actually getting money to place the ads on Google. In any case I guess we won't know for sure until Google brings out its numbers on April 17th.