By 1977 there were no less than 7,000 tankers having a deadweight capacity of more than 31 0 million tons.
Ngomnyaka wamakhulu amashumi anethoba anamashumi asixhenxe anesixhenxe, kwakungekho tanki zingaphantsi kwamawaka asixhenxe ezazinobunzima obumalunga nekhulu elinamashumi mathathu ananye ezigidi zeetoni.