$ProShares Ultra Bloomberg Natural Gas(BOIL.US)$The average annual decline of this product in the 12 years since it was established. When 16,000 went in at the beginning, it is less than 16; Kold is a little better. When 415 went in, there are still 48. They are all just the differences between a meat grinder that is faster and slower. Has natural gas declined as bad in the past 10 years? Even if natural gas only falls but doesn't rise, why are the two opposite ETFs falling?