According to the average values of several forecasts that were published early in the 1970s, the bulk cargoes carried were predicted to double from about 700 million tons in 1970 to 1 200 to 1 500 million tons in 1980, and by 1990 were expected to triple to about 2,500 to 2,800 million tons.
Ngokomndilili ixabiso ngokwengxelo engaphambili eyasasazwa ebutsheni buka 1970, izithuthi zezambuku ziqikelelwa ekuthwaleni ukuphinda-phinda ukusuka 700 izigidi zetoni ngo 1980, ngo 1990 bekulindeleke ziphindwe kathathu ukuya kwi 2.500 ne 2.800 zezigidi zetoni