The central bank of Norway manages a $700 billion fund of Petro dollars kept from entering the domestic Krone. Good for Norway a country with an annual GDP of some $400 billion. This however, undervalues the Krone and ergo the value of your investment in STO. Think about this a little. This is similar to the central bank of China monetizing U.S. debt to cheapen the Yuan and advance their production.
There is an election coming Sept, and imagine you are a right wing candidate offering a strengthening of the Krone to 4/USD from the current 5.88. This would make the US value $35 today by translation.