Best performing stock index in the world is found in Europe, Bloomberg reports.

While most indices of the continent are in red, Norwegian OBX gained almost 16% this year. According to expert, the key reason for such success is in high exposure of Norway to oil and fish sectors. Oil shares added 11% to return, and fish shares added 5%, while other stocks are slightly down.

Norway is the largest oil producer in Western Europe, and oil prices gained almost 19% this year. State-controlled producer Equinor ASA is a leader among oil shares. It gained 24%. Shares of fish farmer Marine Harvest ASA rose by 33%.

Experts however doubt the stability of such success. Although oil prices are the highest in four year, salmon prices lost 18% compared with peak level in May. Most likely, decline cannot be avoided. However, it shall be expected not earlier than second half of 2019 or beginning of 2020.