epa06213834 (FILE) - A file photo dated 15 August 2017 of the Norwegian Aker B platform on the Valhall oil field in the North Sea. Norwegian authorities on 19 September 2017 stated the oil fund of Norway, the largest sovereign wealth fund in the world, was for the first time valued at more than one trillion USD at 02:01 CET on 19 September 2017. The Bank of Norway Investment Management said a 'strengthening of the world's major currencies against the US dollar, combined with strong equity markets, rapidly increased the US dollar value of the fund in 2017'. EPA/HAKON MOSVOLD LARSEN NORWAY OUT