In 1950, 46% of Finnish workers worked in agriculture and a third lived in urban areas. The new jobs in manufacturing, services, and trade quickly attracted people to the towns. The average number of births per woman declined from a baby boom peak of 3.5 in 1947 to 1.5 in 1973. When baby-boomers entered the workforce, the economy did not generate jobs quickly enough, and hundreds of thousands emigrated to the more industrialized Sweden, with emigration peaking in 1969 and 1970. The 1952 Summer Olympics brought international visitors. Finland took part in trade liberalization in the World Bank, the International Monetary Fund and the General Agreement on Tariffs and Trade.