One last figure: the landlocked developing countries have transaction costs linked to transport averaging between 15 per cent and 25 per cent, about twice those of transit countries and more than three times those of the developed countries.
最后一组数字：内陆发展中国家同运输有关的交易成本平均在15%到25%之间，大约是过境国家的两倍，是发达国家的三倍以上。