A/RES/58/255 15. Decides that vacancy rates of 10.2 per cent for Professional staff and 7.3 per cent for General Service staff shall be used as a basis for the calculation of the budget for the biennium 2004–2005; 16. Decides also not to approve the proposed increase in resources for consultants and experts; 17. Decides further to approve the proposed post and non-post resources for the Investigations Division for 2004 and to defer consideration of the resource requirements for the Division for 2005 until its fifty-ninth session; 18. Requests the Secretary-General to resubmit, in the context of his first performance report for the biennium 2004–2005, a proposal for the resource requirements for the Investigations Division for 2005, and to ensure that the proposal is adequate for the effective implementation of the completion strategy; 19. Endorses the conclusions and recommendations of the Advisory Committee contained in paragraph 28 of its report;2 20. Concurs with the Advisory Committee that the volume of work and the pace of completion should be monitored continuously in order to determine whether some of the posts identified for abolition or redeployment could be abolished or released for transfer to other areas of the Tribunal before the second half of 2005; 21. Decides to reduce the appropriation for contractual services to the level proposed in the second performance report of the Secretary-General on the programme budget for the biennium 2002–2003 5 as the proposed final appropriation, before recosting, given the savings achieved in respect of defence counsel during the biennium; 22. Decides also to reduce the proposed resources for travel of Registry staff by 200,000 United States dollars; 23. Decides further to appropriate to the Special Account for the International Tribunal for the Prosecution of Persons Responsible for Serious Violations of International Humanitarian Law Committed in the Territory of the Former Yugoslavia since 1991 the total amount of 298,226,300 dollars for the biennium 2004–2005, as detailed in the annex to the present resolution; 24. Decides that the financing of the appropriation for the biennium 2004–2005 under the Special Account shall take into account the estimated income of 184,000 dollars for the biennium 2004–2005, which shall be set off against the aggregate amount of the appropriation; 25. Decides also that the total assessment for 2004 under the Special Account, amounting to 174,689,650 dollars, shall consist of: (a) 149,021,150 dollars, being half of the estimated appropriation approved for the biennium 2004–2005; (b) 25,668,500 dollars, being the increase in the final appropriation for the biennium 2002–2003 approved by the General Assembly in its resolution 58/254 of 23 December 2003; 26. Decides further to apportion the amount of 87,344,825 dollars, being half of the total assessment for 2004, among Member States in accordance with the scale of _______________ 5 A/58/593. 3