Generally Speaking,net Migration into OECD Countries Has

Generally speaking,net migration into OECD countries has

A) Fallen over the last twenty years due to increased emigration by OECD nationals
B) Fallen over the last twenty years due to decreased immigration by non-OECD nationals
C) Risen over the last twenty years due to decrease emigration by OECD nationals
D) Risen over the last twenty years due to increased immigration by non-OECD nationals
E) Stayed roughly unchanged over the last twenty years