This is clearly illustrated by a few figures: At present about 34,000 sea-going ships with a deadweight capacity of nearly 660 million tons carry over 3.6 milliard tons of cargo, representing by far the highest proportion of the goods moving in world trade, over long distances.
Le nto ngokucacileyo ibonakaliswa ngamanani athile ambalwa, ngoku zingamawaka angamashumi amathathu anesine inqanawa ezihamba elwandle nobunzima obufileyo obumayela namakhulu amathandathu anamashumi mathandathu ezigidi zeetoni aphatha ngaphezu 3,6 ewaka lezigidi leetoni zomthwalo, emele okwangoku umlinganiso ophakamileyo wempahla ezisuka kuthengiso oluphakamileyo lelizwe kwimigama emide.