Facts and circumstances determination.
(v) Facts and circumstances determination. The determination of whether the average percentage of total compensation included for the employer's highly compensated employees as a group for a determination period exceeds by more than a de minimis amount the average percentage of total compensation included for the employer's nonhighly compensated employees as a group is based on all the relevant facts and circumstances. The differences between the percentages for prior determination periods may be considered in determining whether the amount of the difference between the percentages is more than de minimis. In addition, an isolated instance of a more than de minimis difference between the compensation percentages that is due to an extraordinary unforeseeable event (such as overtime payments to employees of a public utility due to a major hurricane) will be disregarded if the amount of the difference in prior determination periods was de minimis.