With a population of 4.8 million in 1911, Scotland sent 690,000 men to First World War, of whom 74,000 died in combat or from disease, and 150,000 were seriously wounded. Thus, although Scots were only 10 percent of the British population, they made up 15 per cent of the national armed forces and eventually accounted for 20 per cent of the dead. While emigration began to tail off in England and Wales after the First World War, it continued apace in Scotland, with 400,000 Scots, ten per cent of the population, estimated to have left the country between 1921 and 1931. When the Great Depression hit in the 1930s there were no easily available jobs in the US and Canada and emigration fell to less than 50,000 a year, bringing to an end the period of mass migrations that had opened in the mid-18th century. This contributed to the growth of the population, which reached a peak of 5,240,800 in 1974. Thereafter it began to fall slowly, moving down to 5,062,940 in 2000. There was also a decrease in some urban populations as a result of policies of slum clearance, overspill and relocation to new towns, with the population of Glasgow falling from over a million in 1951 to 629,000 in 2001. Rural areas also saw a loss of population, particularly the Highlands and Hebrides.