From 1953 onwards the deadweight of the largest tanker in service has tripled every 9 to 10 years.
Ukusuka ku1953 ukubheka phambili ubunzima bomthwalo wenqanawa yokuthutha ipetroyile eyona inkulu esetyenziswayo iphinda-phinde kathathu qho iminyaka elithoba ukuya kwelishumi.