There seems to be a race all over the first world to be the first to surrender demographically to the third. Japan being one of the few that continues to resist.
"In Oslo 18 percent of the population has a non-western background"
Heavens, you'd think the Norwegians would learn from the Belgians, Danish, or even the example of Los Angeles.
The immigrants at any level higher than 5-10% will change the city culturally, forever, and will pollute it, too.
As an Angeleno who was raised in that once-beautiful city, I can attest to this effect personally. Mexicans, legal and illegal, have turned LA into a cesspool. It looks and feels, plus has the culture of, Mexico City.
And, for those Freepers whose hackles are already rising, I am an American with a Hispanic surname so don't give me any lectures about being a racist.