The rate will depend on the contract and their status at the time it was signed. Someone at their peak or getting close to it would usually have a contract that increased in value each year. A veteran wrapping up their career would have the opposite (e.g., someone like Vukona perhaps, Gibbo's next contract, Newley's next, etc).
In Ogilvy's case, I'd be surprised if it wasn't the former and imagine he'd be taking the option in either case - not his best season, but I don't know if the Hawks can be choosy, especially if Kay is gone.