They even try to improve their bonus scheme. In a company, it is better to update or change the way on how to compute the bonus of employees especially if the company's profit is not constant.
A company does not maintain its profit if employees know that the calculation of their bonus still remain. If the company decreases its profit, they should minimize giving bonuses so that employees will motivate to focus on their specific job and do their best. So it is better to update the calculation of their employees bonuses