The variance under this heading is attributable primarily to a 100 per cent increase in the price of aviation fuel from the budgeted rate of $0.70 per litre compared to the actual average rate of $1.40 per litre.
31. 本项下出现差异的主要原因是航空燃料价格上涨了100%，预算油价为每升0.70美元，而实际平均油价为每升1.4美元。