A/RES/53/227 Page 4 16. Decides, as an ad hoc arrangement, to apportion among Member States the amount of 136,372,209 dollars gross (132,678,593 dollars net) for the period from 1 August 1999 to 30 June 2000, at a monthly rate of 12,397,474 dollars gross (12,061,690 dollars net) in accordance with the scheme set out in the present resolution and taking into account the scale of assessments for the years 1999 and 2000 as set out in its resolution 52/215 A, subject to the decision of the Security Council to extend the mandate of the Force beyond 31 July 1999; 17. Decides also that, in accordance with the provisions of its resolution 973 (X), there shall be set off against the apportionment among Member States, as provided for in paragraph 16 above, their respective share in the Tax Equalization Fund of the estimated staff assessment income of 3,693,616 dollars approved for the period from 1 August 1999 to 30 June 2000; 18. Invites voluntary contributions to the Force in cash and in the form of services and supplies acceptable to the Secretary-General, to be administered, as appropriate, in accordance with the procedure and practices established by the General Assembly; 19. Decides to include in the provisional agenda of its fifty-fourth session, under the item entitled “Financing of the United Nations peacekeeping forces in the Middle East”, the sub-item entitled “United Nations Interim Force in Lebanon”. 101st plenary meeting 8 June 1999