By that time, less than 5 percent of the people from Chimbote would truly consider themselves native; between 1960 and 1970, Chimbote's population multiplied by more than a hundred times.
Less than 5 percent of the people from Chimbote would truly consider themselves native; between 1960 and 1970. This is by that time.1960 and 1970 are Chimbote's population. This Chimbote's population is multiplied by more than a hundred times.