I am the official currency of a country known for its fjords, Vikings, and Nobel Peace Prize. My name is derived from a word meaning 'neck' or 'narrows.' Historically, my value was linked to gold, but now it floats freely. The central bank responsible for me is known as Norges Bank.

1. My name sounds similar to 'crown'.
2. The country using me is not a member of the Eurozone.
3. Oil and gas are major exports from this country.
4. This country is ranked as one of the happiest countries in the world.