From: International knowledge flows and technological advance: the role of migration
Country
1990
2000
Belgium
4.33Â %
5.78Â %
France
3.1
4.9
Germany
1.72
2.39
Great Britain
3.2
3.9
Italy
0.96
2.0
Spain
2.7
4.6
United States
0.82
0.98