...n years without prior injury. *871 Subsequently, at the conference on instruction, the trial court and parties agreed that the jury be charged in the language of Florida Statute §
769.03, F.S.A., which provides as follows: "The persons mentioned in §
769.01 [persons engaged in hazardous occupations] shall not be liable in damages for injuries to their agents and employees, or for the death of such agents and employees, where same is done by their consent, or is caused by their own negligence. If the employees or agents injured or killed, and the persons mentioned in §
769.01, or their agents and employees are both at fault, there may be a recovery, but the amount of the recovery shall be such a proportion of the entire damages sustained, as the defendant's negligence bears to the combined negligence of both the...