Earlier quoted context omitted.
The Nordic countries, New Zealand, Switzerland and Singapore are perceived as least corrupt by experts and in opinion polls. Do the citizens agree?
Norway is doing pretty well for a country with such a large sovereign wealth fund; most places would have had it stolen by now. It seems they just have the ordinary run of scandals: https://www.bbc.co.uk/news/world-europe-45173500
The government has historically tried to avoid doing so, but had to dip into the funds in 2016–2018. The rules around spending was formalized in 2001 [2], but the extent to which Norway was dipping into the funds has been controversial the last few years, with economists warning that it puts the country at risk in a future economic downturn.
Norway's wealth fund is actually codified as law, which makes it difficult for a future government to "steal" it.
[1] https://www.bloomberg.com/news/articles/2018-05-02/norway-st...
[2] https://www.regjeringen.no/no/tema/okonomi-og-budsjett/norsk...