Between 1950 and 1970, world seaborne trade increased at a rate that corresponded to a doubling every 10 years.
Phakathi komnyaka ka 1950 nowe 1970 urhwebo lomthwalo ngenqanawa elwandle lwehlabathi lwenyuka ngesantya esingqinelanayo nokophinda-phinda rhoqo kwiminyaka eyi-10.