The 1920 census estimated the population of Santiago to be 507,296 inhabitants, equivalent to 13.6% of the population of Chile. This represented an increase of 52.5% from the census of 1907, i.e. an annual growth of 3.3%, almost three times the national figure. This growth was mainly due to the arrival of farmers from the south who came to work in factories and railroads which were under construction. However, this growth was experienced on the outskirts and not in the town itself.