Over recent years the limit in the deadweight capacity of tankers increased by between 50,000 and 100,000 tons every two years.
Ngaphaya kweminyaka esanda kudlula imida kubunzima obungekhoyo kwisikhundla setanki ezande ngokuphakathi kwe 50.000 ne 100.000 zetoni rhoqo kwiminyaka emibini