Assuming 30 trading days horizon, Stockholm is expected to under-perform the SELENA. But the index apears to be less risky and, when comparing its historical volatility, Stockholm is 24.51 times less risky than SELENA. The index trades about -0.2 of its potential returns per unit of risk. The SELENA OIL GAS is currently generating about 0.2 of returns per unit of risk over similar time horizon. If you would invest  250.00  in SELENA OIL GAS on May 20, 2013 and sell it today you would earn a total of  66.00  from holding SELENA OIL GAS or generate 26.4% return on investment over 30 days.