For example, over the period from 1970 to 1980 the prediction was that the world trade volume would again double from 2.3 to 4.8 milliard tons.
Umzekelo ngaphaya kwesigaba sexesha ukusukela ku 1970 ukuya ku 1980 isiprofetho sasisesokuba umthamo worhwebo lwehlabathi lakuphinda kwakhona luphinda -phindane ukusukela ku 2,3 ukuya ku 4,8 lewaka lezigidi lwezinto.