Dr. Albert Schmid President of the Federal Office for Migration and Refugees According to the United Nations, about 200 million people of the estimated world population of 6.8 billion are international migrants - that corresponds to about three per cent of the total world population. The proportion of international migrants in the global population has increased only marginally in the last 40 years. But, as a result of global population growth, the absolute number of migrants has increased, and their structure and spatial distribution has changed considerably. A structural shift has taken place primarily in the industrialised countries, where less than 20 per cent of the global workers are now living, but where more than 60 per cent of all migrants worldwide reside. Since 1990, more than 16 million people have moved to Germany, while about 11 million have left the country in the same period. Altogether, 15 million people of international migration origin are living in Germany, comprising almost 19 per cent of Germanys current population of 82 million. At the end of 2006, about 64 million people out of Europes population of 732 million, or nine per cent, lived in a European country they were not born in. But why does anybody migrate at all? People decide to leave because, in general, they expect to find better conditions and opportunities in other countries or regions.

Thomas Salzmann is Research Scientist, Department of Demography, at Rostock University, Germany. Barry Edmonston is Research Professor, Department of Sociology, and Associate Director, Population Research Group, at the University of Victoria, Canada. James Raymer is a Lecturer in Demography in the Division of Social Statistics located in the School of Social Sciences at the University of Southampton, United Kingdom.

Population Dynamic Processes Caused by Migration - Migration and Fertility, Mortality/Morbidity - Demographic Processes of Certain Immigrant Groups - Socio-demographic and Economic Aspects of Migration - Migration and Employment - Forecasting International Migration

Motives, Explanations and Consequences