Over the course of 20 years, between 1960 and 1980, the proportion of the world tonnage represented by general-cargo ships dropped from 60 % to less than 20 %.
Ngaphaya komlinganiselo wamashumi amabini eminyaka, phakathi ko1960 kwakunye no1980, umlinganiselo womthamo wenqanawa ye-oyile elinganiswe ngeetoni womhlaba omelwe ziinqanawa zokuthutha imithwalo jikelele yehle ukusuka kwiipesenti ezingamashumi amathandathu ukuya ngaphantsi kweepesenti ezingashumi amabini.