Later revisions in the Citizenship Law tightened the quota (to 0.05%), but widened the categories of people eligible to enter Estonia outside the quota (such as family reunification and the migration of EU citizens and citizens of other developed countries).
China and some other countries even restrict the migration of their citizens within their own borders.
Meanwhile, the increasing migration of EU citizens caused by the inability of countries to control their borders under the single market is increasing tensions across the continent.
In the second place, as Romanian and Bulgarians ministers keep explaining, the big migration of their citizens took place in 2007, when they joined the EU.
Should it continue, migration on this scale won't have been seen since the period after the First World War, when the British government assisted migration of its citizens to the countries of the Commonwealth.
But the last Soviet dinosaurs shied away from it, and even Erich Honecker's East German thugs decided not to use force to stop the mass migration of their citizens through Hungary to the West, thus ensuring the collapse of European communism.
Moreover, the more rapid response of the working-age population may reflect more the effect of enlargement than a migration of national citizens.
This was exacerbated around the time of a coup in 2000 which, along with previous coups in 1987, has been particularly associated with migration of Fiji citizens of Indian descent ("Indo-Fijians").
A second, less discussed impact of medical tourism on health worker migration is to encourage the migration of non-citizen health workers to medical facilities serving medical tourists abroad.
When several steps were taken to restrict the migration of non-EU citizens to the country the number of humanitarian and family migrants fell, while the number of other migrant categories rose.
Eritrea and Afghanistan are two of the other main sources of the migration crisis, with citizens of both countries face brutal journeys over thousands of miles to reach Europe, and many die en route.
