As a rule, salaries were raised on a percentage basis for the entire faculty. For example, they would announce a 3% raise for the next year's contract, and I would get somewhere between 3 and 3.5%.
I know of no case in all my years of teaching where the superintendent, principal, dean or provost called any faculty member into the office and said "Congratulations! because of your great performance, we are giving you a $X raise this year, next year, whenever." It just doesn't work that way. I know of no school where it does.
I recall the pharmacist and owner of a drugstore where I worked handing me $75 extra because I worked 78 hours one week when everyone else was on vacation.