Decides also, as an ad hoc arrangement, taking into consideration the funding through voluntary contributions from the Government of Kuwait of the two-thirds share of the cost of the Observation Mission, equivalent to 33,503,700 dollars, to apportion among Member States the amount of 18,640,100 dollars gross (16,751,900 dollars net), representing one third of the cost of the maintenance of the Mission for the period from 1 July 1998 to 30 June 1999, the said amount to be apportioned at a monthly rate of 1,553,342 dollars gross (1,395,992 dollars net), in accordance with the composition of groups set out in paragraphs 3 and 4 of General Assembly resolution 43/232 of 1 March 1989, as adjusted by the Assembly in its resolutions 44/192 B of 21 December 1989, 45/269 of 27 August 1991, 46/198 A of 20 December 1991, 47/218 A of 23 December 1992, 49/249 A of 20 July 1995, 49/249 B of 14 September 1995, 50/224 of 11 April 1996, 51/218 A to C of 18 December 1996 and 52/230 of 31 March 1998 and its decisions 48/472 A of 23 December 1993 and 50/451 B of 23 December 1995, and taking into account the scale of assessments for the years 1998 and 1999, as set out in its resolution 52/215 A of 22 December 1997, subject to the review by the Security Council with regard to the question of termination or continuation of the Mission;