(Sweden is comparable in proportion of foreign immigrants to New York, Florida, or Hawaii; a bit lower than California; much more than most US states. As far as diversity is concerned, Japan/Taiwan are more like West Virginia.)

The article doesn't say where those immigrants are from. Swedes and Norwegians have different cultures and histories, but there's a huge difference between 20% Norwegian immigrants and 20% Chinese immigrants

According to Wikipedia the biggest groups are Syrians, Iraqis, and people from the former Yugoslavia. There are also a lot of Finns. Then there are Poles, Iranians, Somalis, Afghans, Turks, Germans, Eritreans, Thais, Indians, Norwegians, Danes, Chinese, Romanians, Etc.

Something like 5% of Swedish-born residents are descended from Finns if you go back a few generations (not counted among foreign-born immigrants).

I found a spreadsheet at https://www.scb.se/hitta-statistik/statistik-efter-amne/befo... (Thanks Google Translate!)

2 million are not born in Sweden.

Of these, the top 10 are:

  Syrien 193,594
  Irak 146,440
  Finland 140,337
  Polen 93,762
  Iran 81,301
  Somalia 70,184
  Jugoslavien 63,419
  Afghanistan 60,858
  Bosnien och Hercegovina 60,161
  Turkiet 52,628

(The bottom includes the 1 person from Tuvalu.)

Then there's "born in Sweden, both parents from the same foreign country"

  Finland 62,042
  Irak 58,864
  Syrien 32,829
  Jugoslavien 30,903  (Yugoslavia)
  Somalia 30,743

"Born in Sweden, parents from two different foreign countries, father's country"

  Jugoslavien 13,111
  Irak 10,530
  Syrien 7,880
  Libanon 7,604
  Turkiet 5,969

"Born in Sweden, parents from two different foreign countries, mother's country"

  Finland 13,968
  Jugoslavien 10,696
  Syrien 9,381
  Polen 5,949  (Poland)
  Libanon 5,645

"Born in Sweden, mother from Sweden, foreign-born father"

  Finland 65,872
  Danmark 29,235
  Norge 27,275    (Norway)
  Tyskland 23,670  (Germany)
  Förenade kungariket 16,965  (UK)

"Born in Sweden, father from Sweden, foreign-born mother"

  Finland 113,178
  Norge 39,676
  Tyskland 25,560
  Danmark 22,990
  Polen 16,279