Contributory fault does not bar recovery in an action by any person to recover damages for death or injury to person or property unless the fault was as great as the combined fault of all other persons who contribute to the injury, but any damages allowed must be diminished in proportion to the amount of contributing fault attributable to the person recovering. The court may, and when requested by any party, shall direct the jury to find separate special verdicts determining the amount of damages and the percentage of fault attributable to each person, whether or not a party, who contributed to the injury. The court shall then reduce the amount of such damages in proportion to the amount of fault attributable to the person recovering. When two or more parties are found to have contributed to the injury, the liability of each party is several only, and is not joint, and each party is liable only for the amount of damages attributable to the percentage of fault of that party, except that any persons who act in concert in committing a tortious act or aid or encourage the act, or ratifies or adopts the act for their benefit, are jointly liable for all damages attributable to their combined percentage of fault. Under this section, fault includes negligence, malpractice, absolute liability, dram shop liability, failure to warn, reckless or willful conduct, assumption of risk, misuse of product, failure to avoid injury, and product liability, including product liability involving negligence or strict liability or breach of warranty for product defect.