Norway was not that poor before oil. That’s a myth. Relative to some other European countries, yes. But it was still a country with a long history of trade, industry and natural resources.
Though I’m not surprised a Swede thinks of us mainly as poor farmers ;) (no bad feelings, you literally had an empire so the attitude is understandable)
Sorry, I have that image due to, just the image of a "poor" fishing country. Now we envy you and I heard all my life that we in Sweden are Norways poles/polacks due to cheap labour from Sweden.
That said we in Sweden where extremely poor too, see the famous book "Utvandrarna" for how it could be so miserable that people left.
Now we are the ones causing issues - "det svenske tilstander"
Well, I say "we" but these are not the Kalles Kaviar looking people. It could get to that point though...