In the span of seven or eight years from the moment oil production began, their economy tripled in size (from 1973 to 1981). Oil caused that economic miracle.
Norway GDP per capita in 1973, pre oil, was $5,600 or so. Sweden was $7,200. Denmark was $6,100. Finland was $4,200.
Norway's GDP per capita in 1984 as the oil boom was underway was $15,000. Sweden was $13,000. Denmark was $11,500. Finland was near $11,000. Keep in mind these other three are among the best run couple dozen nations on earth.
Today: Norway $75,000; Denmark $56,000; Sweden $53,000; Finland $46,000.
Now show me the extraordinary products that Norway is creating and selling to the world, to generate that stunning $75,000 figure, as opposed to Sweden's remarkable economy that has boomed for a long time and is still lagging far behind Norway.
Norway's GDP per capita went from $38,000 in 2001 with cheap oil prices, to $97,000 by the end of 2008, due to the oil boom. It's very obvious that Norway owes its particular outlier performance to oil.