Except in a Y2K action that is a contract action, and except as provided in subsections (b) through (g), a person against whom a final judgment is entered in a Y2K action shall be liable solely for the portion of the judgment that corresponds to the relative and proportionate responsibility of that person. In determining the percentage of responsibility of any defendant, the trier of fact shall determine that percentage as a percentage of the total fault of all persons, including the plaintiff, who caused or contributed to the total loss incurred by the plaintiff.