33 . Concerning national staff , the estimated requirements amount to $ 9,726,000 , an increase of $ 2,095,900 ( 27.5 per cent ) over the current period , based on a turnover factor of 15 per cent , G-4 , step VI , and National Officer ( NO ) -B , step V , salaries and staff assessment and common staff costs of the national staff salary scales in effect from 1 June 2002 .