Working capital. For purposes of subparagraph (1)(i) of this paragraph, working capital of a controlled foreign corporation is the excess of its current assets over its current liabilities. Liabilities maturing in one year or less shall be considered current liabilities. A determination of the amount of working capital of a controlled foreign corporation which is reasonably necessary for the production of export trade income will depend upon the nature and volume of the activities of the controlled foreign corporation which produce export trade income as they exist on the applicable determination date. In determining working capital which is reasonably necessary for the production of export trade income, the anticipated future needs of the business will be taken into account to the extent that such needs relate to the year of the controlled foreign corporation following the applicable determination date; anticipated future needs relating to a later period will not be taken into account unless it is clearly established that such needs are reasonably related to the production of export trade income as of the applicable determination date.