22 U.S.C. § 285k

(a) The letters of credit provided for in section 285 l of this title shall be issued to the Bank only to the extent that at the time of issuance the cumulative amount of the United States Special Resources provided to the Bank (A) constitute a minority of all special funds contributions to the Bank, and (B) are no greater than the largest cumulative contribution of any other single country contributing to the special funds of the Bank. (b) The United States Governor of the Bank shall give due regard to the principles of (A) utilizing all special funds resources on an equitable basis, and (B) significantly shared participation by other contributors in each special fund to which United States Special Resources are provided.