Out of court settlements are NOT public record, as they occur "out of court" directly between the plaintiff and defendant. Settlement agreements in civil cases are NOT filled with the court. Our court system doesn't support a settlement process in most case (you either proceed to verdict or drop it), so pretty much all settlements are done out of court. Further, most settlement agreements include a non-disclosure component, restricting the parties from publicly divulging the details of the agreement.
The majority of civil cases are ended via settlement. The whole court process is utilized to establish the positions of both parties to build leverage for the settlement, based upon each parties gut on where the verdict and damages will end up in that particular case.
Further, settlements are far more common when the defendant doesn't' have deep pockets. Juries are far more likely to give large judgements against perceived large and evil corporations and therefore more attorneys will take their chances with the jury.
My only point is that your only meaningful data point here will be from people, usually attorneys, that have experience with these types of cases and their settlement behavior, as they are the only ones exposed to the details.
Larry