The development of the sheep-breeding industry in the second half of the 19th century was accompanied by substantial immigration, increasing the population sevenfold in fifty years, from 287 in 1851 to 2,043 in 1901. The vast majority of immigrants during that period came from the British Isles, mostly from Scotland. Scots were particularly common in Darwin, many of them coming from the Orkney and Shetland Islands, which have a similar climate to these areas. An additional boost to that population growth came from the expansion of Stanley's port activities in service of the ships sailing between the Atlantic Ocean and the Pacific via the Strait of Magellan or Cape Horn. The port was particularly busy during the California Gold Rush, subsiding following the opening of the Panama Canal in 1914. The early 20th century brought about a new industry to the region, Antarctic whaling in South Georgia, that supported a transient population varying from few hundred in winter to over 1,000 in summer. Some Falkland Islanders found employment with South Georgian whaling bases or ships, while some whalers settled in the Falklands to blend into the local populace. The whalers were predominantly Scandinavian (Norwegians, Swedes and Danes), with a minority of Britons, Germans, and a variety of other European nations. As a result of both natural demographic growth and ongoing immigration, the population of the Falkland Islands reached a peak of 2,392 recorded in the 1931 census, a figure that would not be surpassed until late in the twentieth century. Having shrunk as low as 1,813 in 1980, since the Falklands War the number of Falkland Islanders has been steadily increasing to exceed 3,100 in 2007. That new growth was supported by a thriving economy, with wool monoculture giving way to a more diversified agriculture, fisheries and tourism, augmented with services related to the military garrison as well as to the islands' role as one of the major gateways to neighbouring Antarctica. According to the 2001 census, the people who have settled in the Falklands during the last decade originated from the United Kingdom (30 per cent of the entire population excepting those resident in connection with the military garrison, including however some children born abroad to Falklander parents), Saint Helena and Ascension Island (6 per cent; 15.8 per cent if people resident in connection with the military garrison were included, Chile (3 per cent), Australia and New Zealand (2.3 per cent), Argentina (1 per cent), followed by Russia, Germany, with minor contributions by several dozens other nations from six continents.